Can an aunt be a surrogate mother for her half-nephews baby?
Is his partner female and will they be using her egg? If yes, there is nothing morally or medically wrong with it. She would be carrying a baby that is not her biological child and it would have no more of her DNA than it would if he and his partner had a baby not involving her. If they are using someone other than the aunt’s egg, also nothing morally or medically wrong. But if they are using the 1/2 nephew’s sperm and his aunt’s egg, they may be too closely related and it may not be allowed. I think the reason for that is because close family members may have certain diseases or genetic abnormalities in common, and the risk of the baby inheriting may be increased. For example, cystic fibrosis or sickle cell disease. They may be allowed, if it’s legal in their state (in some states 1st cousins can marry/have a child, in others it’s not allowed, and it may be different or more “allowable” since this is her 1/2 siblings child and not a full siblings child, so not as much in common as far
