You never hear much about Beyoncé's little brother -- the child that Matthew Knowles had with his mistress while still married to Beyoncé's mother, Tina Knowles -- but that is all about to change as the child's mother has come forward to say that not only has Beyoncé never met the now-4-year-old Nixon, but Matthew is nothing but a deadbeat baby daddy who doesn't even provide the basics for his son!

In her first ever interview, given exclusively to Inside Edition, Alexsandra Wright -- the mother of Nixon -- says that Matthew is behind in child support to the tune of $32,000! "It's disappointing. I'm not angry. I'm disappointed. More than anything he raised two other children and was very active and involved in their lives and they turned out very well, so why he's choosing not to acknowledge his only son, I don't know, but it's disappointing," said Wright.

And, according to EuroWeb, Wright -- who had an 18-month affair with the once-powerful music industry mogul, while he was still married to Tina -- was forced to obtain public assistance, including welfare, Section 8 housing, and food stamps, to care for the child she had as a result of the affair. Most shocking of all, however, was her claim that Matthew insisted she give the child to Beyoncé and her husband, Jay-Z, to raise as their own (this was before Blue Ivy was born)... a request that Wright steadfastly refused to indulge. "I don't expect Beyoncé to take accountability. It's not her problem. It's not her situation," she said." "Beyoncé and Jay Z have never attacked me. They've [never] done anything wrong to me. They've never been negative at all."

On Nov. 11, 2009, Tina Knowles filed for divorce after several reports about Matthew's affair with actress Alexsandra Wright had surfaced. The reports went as far as claiming that Wright was pregnant with Knowles' child. After Wright's son Nixon was born, she requested a paternity test from Knowles, who had admitted to having an affair with her. The paternity test was positive and Knowles was ordered to pay child support to Nixon and Wright.

Check out the interview with Wright below.