It's all in the genes, except when it isn't.
Mundy
Liza
L
D000300:Adoption; D030881:Disclosure; D005260:Female; D006801:Humans; D008297:Male; D018587:Oocyte Donation; D010287:Parent-Child Relations; D010290:Parents / Q000523:psychology; D010375:Pedigree; D027724:Reproductive Techniques, Assisted / Q000523:psychology*; D013094:Spermatozoa; D013533:Gestational Carriers; D014019:Tissue Donors