Rumor has it Beyonce's dad Matthew Knowle is really behind on child support payments on his child and the mother has had to get food stamps.

The woman Alexsandra Wright says she hasn't gotten her 32,135.90 in child support money from Knowles.

TMZ reports,

Wright -- whose son is Beyonce's half-brother -- is now on public assistance ... and gets $300 a month on a state-issued EBT card to pay for food and other expen

Sources tell us Wright went to court for help ... but the judge is noodling over exactly what to do.
Knowles insists he's not a deadbeat dad ... and has blamed a clerical error for the delinquency.