The OP is assuming a lot.
1. He's assuming the woman he sees at the store isnt a bum...if it wasnt a lame ass brother, she would have gotten pregnant by a lame ass white cat.
2. The kids will grow up w/ self hate... Not everyone is hung up on race...and the generation coming up now will view things a lot different than adults now.
3. That she is actually single... How do you know that? The boyfriend/husband has to be around all the time because the kids are mixed?