The 60-year-old fathered a son during an 18-month extramarital affair with former Scrubs star Alexsandra Wright, 40, but apparently he begged the boy's mother to hand the child over to Beyonce, so she could raise him as her own.
Alexsandra, who is no longer with Matthew, refused to give up her child and is raising the boy, now 20-months-old, with her new boyfriend.
“My first thought when he asked me if I would give up our child to Beyonce and Jay-Z was, 'Are you out of your mind?'” Wright tells Star magazine.
“Nothing in the world, no amount of money would make me give up my child, you can't buy my child from me!”
“Maybe Mathew thought money could buy anything,” she adds.
The couple ended their affair before the baby was born, and Wright claims Mathew then tried to offer her money to leave his name off the birth certificate.
Wright refused, and after a paternity battle which proved the baby was his, Tina Knowles (Beyonce's mother) filed for divorce.
Mathew has never met his son, despite having “prayed for a boy” during the pregnancy, Wright says.
She also insists that Beyonce knew nothing of her father's scheme to have her raise her own half-brother.
“I don't believe that Beyonce or anybody else has a clue about what was flying out of Mathew's mouth,” she adds. “I don't think it was anybody but Mathew.”