Do Adopted Children Count Towards “Marry Off 6 Children” Want?

Unfortunately, I do not think adopted children count towards the “Marry Off 6 Children” lifetime want. I get this Lifetime Want frequently, since I frequently choose the Family Aspiration. The first time I tried to complete it, my couple had 5 children and adopted one. All are married now, but the want was not fulfilled. I’m currently trying again and making sure none of the children are adopted. Has anyone else confirmed that adopted children do not count? It doesn’t seem very fair.