Your mom and I will support you as long as you date women. It doesn't even matter if she's black, as long as it's a woman.
Do you have a problem with homo or bisexuality?
I just told you it's my own personal experience that I'm giving you. A black guy dating one woman is not really something unusual.
Not supporting someone unless they have a certain sexual preference is wrong. They are not in control of who they like so you shouldn't force them to like a certain set of characteristics. He may cut himself off of the family and you may never see them again if you continue.
If a black woman will make someone happy then I will support them, but I know what I would like to see.
If your kid is gay no amount of conversion or wishing is going to change his sexual attraction. You should just learn to accept him as he is, he will make his own decisions and if he wants to stay single thats ok too.