Responses

Thats true.. The closer they are the more risk it is for babies. Well defects dont always arise 100% in babies from 1st cousins but sometimes there are cases of heriditary issues in babies from distant cousins..ultimately its all genetic probability lol n luck i'd say but still its best n responsible to not marry your cousins
Their family tree is a circle lmfao. As someone with a masters in genetics i cant help but flinch whenevr i see how close the relatives are getting married or engaged. I knoe its fiction and its funny but remembering how the habsburgs n egyptians n almost all of european royalty genepool goes bcuz of generational incestual inbreeding i cant help but cringe a little but ig its fiction so its fine luca's descendants wont end up with grotesque jaws or abnormalities