They have always rejected mixed marriages and children fathered by non-Yazidis. In this case, the stain is even greater since the fathers were the same Sunni Muslim radicals who sought to wipe out the community. Under Iraqi law, the children are considered Muslims.
[...]
But the Yazidis' spiritual leader, Babashekh Khirto Hadji Ismail, issued an edict in 2015 declaring women enslaved by the militants to be "pure," with their faith intact. The declaration allowed the women to be welcomed back into Yazidi society.

But not the children.
[...]
Back among her community, cut off from her son by borders, traditions and officials, she sees no choice now. She will bury it all. She'll get married, she says. She'll build a new family.

"I'll make it like I never saw anything. I'll try to forget everything and start a new life."