Well, unlke T Cassedy, I think the biological parents should be the direct line and the adoptive parents linked to in the biography. The thing is that the purpose of WikiTree is the join all the people of the world into one connected tree. If you don't use bio parents as the connecting line, it can make attempts to determine connectedness wrong. (of course this is my opinion, but I think it's also the WikiTree position.) Nobody's going to be dinged for doing it the other way, but someday it will probably be changed by people who don't have an emotional tie to the only people you knew (as grandparents in this case).