...Until quite recently, such population growth always came primarily from increases in the numbers of young people. Between 1950 and 1990, for example, increases in the number of people under 30 accounted for more than half of the growth of the world's population, while only 12 percent came from increases in the ranks of those over 60.

But in the future it will be the exact opposite. The U.N. now projects that over the next 40 years, more than half (58 percent) of the world's population growth will come from increases in the number of people over 60, while only 6 percent will come from people under 30. Indeed, the U.N. projects that by 2025, the population of children under 5, already in steep decline in most developed countries, will be falling globally -- and that's even after assuming a substantial rebound in birth rates in the developing world. A gray tsunami will be sweeping the planet.

Which countries will be aging most rapidly in 2025? They won't be in Europe, where birth rates fell comparatively gradually and now show some signs of ticking up. Instead, they'll be places like Iran and Mexico, which experienced youth bulges that were followed quickly by a collapse in birth rates. In just 35 years, both Iran and Mexico will have a larger percentage of their populations over 60 than France does today. Other places with birth rates now below replacement levels include not just old Europe but also developing countries such as Brazil, Chile, China, Lebanon, Tunisia, South Korea, and Vietnam.

Because of the phenomenon of hyper-aging in the developing world, another great variable is already changing as well: migration. In Mexico, for example, the population of children age 4 and under was 434,000 less in 2010 than it was in 1996. The result? The demographic momentum that fueled huge flows of Mexican migration to the United States has waned, and will wane much more in the future. ...

Another related megatrend is the rapid change in the size, structure, and nature of the family. In many countries, such as Germany, Japan, Russia, and South Korea, the one-child family is now becoming the norm. This trend creates a society in which not only do most people have no siblings, but also no aunts, uncles, cousins, nieces, or nephews. Many will lack children of their own as well. Today about one in five people in advanced Western countries, including the United States, remains childless. Huge portions of the world's population will thus have no biological relatives except their parents.

Labels: aging, demographics, family size, family structure, Marriage, religion, siblings

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Laura Ashmore and Jennifer Williams are sisters. After that, their relationship becomes more complex.

When Ms. Ashmore and her husband, Lee, learned a few years ago that they could not conceive a child, Ms. Williams stepped in and offered to become pregnant with a donor’s sperm on behalf of the couple, and give birth to the child. The baby, Mallory, was born in September 2007 and adopted by Ms. Ashmore and her husband.

Then the sisters began to ponder: where would the little girl sit on the family tree?

“For medical purposes I am her mother,” Ms. Williams said. “But I am also her aunt.”

Many families are grappling with similar questions as a family tree today is beginning to look more like a tangled forest. Genealogists have long defined familial relations along bloodlines or marriage. But as the composition of families changes, so too has the notion of who gets a branch on the family tree.

Some families now organize their family tree into two separate histories: genetic and emotional. Some schools, where charting family history has traditionally been a classroom project, are now skipping the exercise altogether. ...

Ms. Battel and her husband also debated whether to include other children born using their donor’s sperm. After all, those children would be biological half-siblings to Dori. Their verdict: “We decided they are not half-siblings, but donor siblings,” Ms. Battel said. “We honor them, but they are not part of the family.”

Labels: children, culture, donor conception, parenting, siblings

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Unborn twin babies socialize as early as week 14 of gestation, a new study has shown.

Italian researcher Dr. Umberto Castiello of the University of Padova and associates used an advanced method of ultrasonography, which enables the movements of the babies to be recorded over time in 3D, to study five pairs of twins from a sample of low-risk pregnant women attending the Institute of Child Health I.R.C.C.S. Burlo Garofolo. ...

“Although various types of inter-twins contact have been demonstrated starting from the 11th week of gestation,” Dr. Castiello said, “no study has so far investigated the critical question whether intra-pair contact is the result of motor planning rather then the accidental outcome of spatial proximity.”

The five pairs of twins were studied during two separate recording sessions carried out at the 14th and 18th week of gestation.

The first 20-minute recording sessions showed the unborn twins touching each other as well as themselves, and the uterine wall.

During the second recording, four weeks later, their interest in their twin was approximately three times higher, with almost 30 per cent of movements directed towards the sibling. Those movements were also more accurate and of longer duration then self-directed ones, the researchers reported.

Labels: children, pregnancy, siblings

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Ryleigh Shepherd was conceived in 1998, the same year as her 11-year-old twin sisters, but she wasn't born until 2010.

The three girls from Walsall, in Great Britain, who were born more than a decade apart in two different centuries, are actually fraternal triplets born through in vitro fertilization (IVF).

Ryleigh came from the same batch of embryos that had allowed her parents -- Lisa and Adrian Shepherd -- to give birth to twins Megan and Bethany.

British experts say they know of no other case in their country in which three siblings from the same round of fertility treatment have been born with such an age gap.

The longest interval between freezing and conception was in the case of a woman from New York City whose embryo had been stored for 20 years, according to a report in the journal Fertility and Sterility.

"It seemed strange to think that we were using embryos that we had stored all those years ago, that were conceived at the same time as the girls," Lisa Shepherd, 37, told Britain's Daily Mail newspaper.

"We knew that if we had another baby it would in effect be the girls' triplet as they were all conceived at the same time," she said. The girls look exactly alike, according to their mother. "It was uncanny."

Labels: Artificial Reproductive Technology, IVF, siblings, United Kingdom

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Helene Lauffer knew Muslim children - orphaned, displaced, neglected - needed homes in the United States. She knew American Muslim families wanted to take them in.

But Lauffer, associate executive director of Spence-Chapin, one of the oldest adoption agencies in the country, couldn't bring them together.

The problem was a gap between Western and Islamic law. Traditional, closed adoption violates Islamic jurisprudence, which stresses the importance of lineage. Instead, Islam has a guardianship system called kafalah that resembles foster care, yet has no exact counterpart in Western law.

The differences have left young Muslims with little chance of finding a permanent Muslim home in America. So Lauffer sought out a group of Muslim women scholars and activists, hoping they could at least start a discussion among U.S. Muslims about how adoption and Islamic law could become compatible. ...

The prohibition against adoption would appear contrary to the Quran's heavy emphasis on helping orphans. The Prophet Muhammad's father died before his son was born, so the boy's grandfather and uncle served as his guardians, setting an example for all Muslims to follow.

However, Islamic scholars say the restrictions were actually meant to protect children, by ending abuses in pre-Islamic Arabic tribal society. ...

Open adoption, which keeps contact between the adoptee and his biological family, is seen as one potential answer. In New South Wales, Australia, child welfare officials created an outreach program to Muslims emphasizing that Australian adoptions are open and adopted children can retain their birth names. The New South Wales program is the only well-known adoption campaign targeting a Muslim minority population in a Western country.

Labels: adoption, Islam, religion, siblings

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The two sets of 15-year-old twins on opposite sides of the country share a lot of similarities.

Ask all four of them their favorite food, they will say sushi. Ask them about an annoying habit, they will say they bite their nails. They describe themselves as athletic, outgoing and open-minded. They have brown hair, full lips and broad hands.

They are also the biological offspring of sperm donor No. 1096.

Fifteen years ago, sperm donation enabled two mothers to give birth to the children they always wanted. Now the internet age has allowed their twins -- Jonah and Hilit Jacobson in Georgia and Jesse and Jayme Clapoff in California -- to find each other.

Their connection happened partly from persistence and partly from luck in 2007. The two families had joined the Donor Sibling Registry online, where they found their half siblings by searching for families with a matching donor identification number.

These aren't the most conventional sibling relationships, but the teens are gradually forming friendships and growing closer, the siblings say. Today, 12 offspring from sperm donor No. 1096 have connected through the site. ...

The Jacobson twins said they don't want to know or meet their sperm donor.

"I already have a dad," Hilit said.

Jonah chimed in, "I have no desire to meet him. Maybe I'd like to see a picture of him, but that's it."

A family isn't just about biological connections in the Jacobson household.

They said, "A family is what you make it." ...

Like many young men, the money from the donations went to pay for bills during school. He said he didn't think much about what happened to his donated sperm after he graduated.

Then three years ago, he received an unexpected e-mail from a child conceived from his sperm. The 14-year-old girl revealed to him the donor identification number from her file.

She had done some detective work on her own to find his e-mail. She was excited to learn that her donor identification number matched his.

Whitehurst was already the father of two children when he received the e-mail. Still, he chose to have a relationship with the 14-year-old girl. Over the years, Whitehurst has been contacted by two more of his donor offspring through the web.

The three donor siblings and Whitehurst have formed a bond. He takes the donor offspring and his own children on vacation together. He said the children all get along.

"They don't expect anything undue from me," said Whitehurst, now a 44-year-old physician, adding that, "They don't expect me to show up and become a full-time dad. I like to get together with them, and the great thing is my two kids like them, too."

But some reproductive technology experts said a generation of sperm donor children easily connected by the web comes with challenges. Not all sperm donor offspring want to get to know their half siblings or the sperm donor, said Susan Crockin, an attorney and reproductive technology expert in Massachusetts.

"What if someone and their family don't want to be a part of an unexpected family?" Crockin said.

Labels: culture, donor conception, Fathers, My Daddy's Name Is Donor, siblings

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This story beats love at first sight. Two people longed for each other, though they may have never met. They felt connected though they may never have touched. They'd even been given the same first names, though their families were strangers. By the time Meredith Grace Rittenhouse and Meredith Ellen Harrington were finally introduced, love was almost beside the point. Their bond was more mysterious, more fundamental. The Merediths are Chinese fraternal twins who were adopted by two different American families. The girls found each other almost six years ago, when they were 4, and haven't let go since.

Labels: adoption, China, siblings

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