It is legal, for sure. Whether it's acceptable may depend on how closely they were raised as siblings. Like, if they were really little when the new
One of my co-workers has just recently become engaged to his former step sister. The parents of the two people have been divorced now for going on two years.
Lifer. half sisters and brothers are blood related by one parent. step sisters and brothers are not related at all, but have the same parent caring for them.