My sim forgot his step dad and started flirting with him.

So I aged up my sim and moved him out of his parents' house. Off to university he went and then got a house of his own. Decided to invite the family over to celebrate. But oh, Oh NO. He decides that flirting with his step dad who is married to bio dad IN FRONT OF BIO DAD is a good idea.

So yeah I want a more in depth family tree that includes step parents and such cause now my sim has a love bar with his dad and I am not okay.