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Thousands of children are conceived using sperm and egg donors every year, a group large enough to entice MTV to air “Generation Cryo.” The show may make some uncomfortable, but for others, “Generation Cryo” will symbolize how a new generation is redefining family.

The show follows a teenager as she sets out to find her “donor dad,” and along the way, she discovers she has more than a dozen half-siblings.

Breeanna Speicher is the lead character in the docuseries. She’s 17, cool-looking and poised. Her big brown eyes look straight into a video camera, “For so long it hasn’t even felt like reality that this mystery man brought me into the world. I just want to know who you are!” she says.

She’s not alone. There is no accurate record keeping in the U.S. — no one knows precisely the size of this population. It’s certainly in the thousands.

Kathleen LaBounty lives in Houston. She was conceived by an anonymous sperm donor. She found out she was donor-conceived when she was 8 years old. She says she knew she wanted...