Matthew Knowles babymama speaks out, says Beyonce is not responsible for her son

It was reported recently that Beyonce's 4 year old half brother lives on food stamps after her father Matthew Knowles refused to pay his baby mama child support.

Now, for the first time, Mathew's baby mama speaks out saying she's very disappointed in Mathew and that Beyonce is not responsible for her son...

Alexsandra Wright tells Inside Edition,

"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…”