Well, I do find it strange he has not introduced you to these "family" members. These are normally nothing secretive, and usually your biggest problem will be trying to keep them from your home. However, I now have my doubts that they are his relatives. Your gut instinct is probably right. As for ghetto part what can I say? You are right about the views African men hold about African-Americans. Multiple wives? If his family hooks him up with some well, there is not much even he can do. I really can't help you here. I have a feeling you already know the answers to your questions.
Hard to understand the question. I am also in the US and have seen all combinations of Africans, African American relationships. First thing about Africans is you marry one you marry the family. Africans stick together. His sisters, nieces and aunties are going nowhere. They will call for money, help advice and just for the heck of it. Expect them at your home for vacations. The part about ghetto stereotype has me confused. It is almost as if you are saying you want him to treat you more in a "ghetto" way which I find hard to believe.