unfortunately because of covid, we couldn't have a proper funeral. >> steven gunner had died of a fatalpioid overdose at age 27. after their son's passing, laura and david recalled a group they had heard of years prior, the donor sibling registry. >> imagine if you knew your father only by his code, not his name, the children of sperm donors. >> wendy cramer brought the teens together through her website, donorsiblingregistry.com. she created it with her son, ryan, to him find his own donor dad. laura joined the registry, which was founded in 2000, and allows people to self-report and share their own information. >> i wanted to see pictures of steven's siblings. >> we missed him. >> yeah. and i was hoping to see his smile or features in somebody else. and i also knew that the other families needed to know steven's history. >> laura connected with other parents who had used donor 1558, offering to share steven's story with those who were interested. the gunners would ultimately learn that their son shared a donor with at least 19 other siblings. >> they had already been communicating abo

. >> after their son's death, laura and david gunner were on a mission to find out more about steven'satter how hard we raised steven to be what he was, something came out that we couldn't stop. >> first they connected online with other families who had used sperm donor 1558. and when one of those other parents used a commercial dna kit on their child, that led to donor 1558's mother. their son steven's biological grandmother. >> i needed more information. so i wrote her a letter. >> what did you say in that letter? >> i told her that we und understood, that we knew what she went through and that we had no ill will towards her son. but i had questions. >> laura and donor 1558's mother corresponded for months. >> there were questions specifically on the self-reported donor history that had there been any checks, it would have been determined that it was not truthful. have you ever been hospitalized for anything other than a surgery? donor 1558 wrote no. it was revealed to me by his mother that he spent an entire summer hospitalized in a psychiatric facility when he was about 15. >> and