I just opened my game and my peep got a kid but it didn't even show that my peep inherted the house. Since he wan't married I excepted an email but it wasn't there. So when I opened the generation tree it says I can start a new generation. So I did and I adopted a mohawk kid and it says he has a kid but he isn't even on the family tree.

Sounds like a case of identity theft.

Depending upon what generation your game has reached, you might have encountered this issue.