Yeah I see it but social stigma is bs. Kids get picked on for anything these days, having older parents, having fat parents, having weird parents etc.
Also, a risk of deformity gets higher, the closer the people are in the gene pool. I mean loads of cousins do get married and their babies turn out alright. They are a father and daughter though, surely they must have had enough sense to see that something must be wrong when they had the first baby and it died? Why the fuck would they continue trying to have kids? That's what I'm getting at.