When Barry Stevens was 18, he found out he was conceived by artificial insemination. A detective story with a difference, Offspring documents Barry’s often hilarious efforts, more than 30 years later, to find out who his real father was. In looking for possible DNA matches with sperm donors, Barry edges closer to the truth about his origins—and is united with a half-brother along the way. Without taking itself too seriously, the film teases out some intriguing questions. How does an infertile father feel about rearing living proof of his failure to procreate? Should a child’s right to resolve an identity crisis supersede the sperm donor’s right to anonymity? And now that genetic science has proved we’re all pretty closely related anyway, is identifying one’s immediate progenitor even relevant?