Beyonce and Jay-Z perform 'Drunk in Love' at the 56th annual Grammy Awards in Los Angeles.

London - Beyoncé Knowles' half-brother's mother isn't angry the singer has never met him.

The 32-year-old star's father Matthew Knowles has a four-year-old son, Nixon, with his ex-girlfriend Alexsandra Wright, who claims he is still behind on his child support payments and never spends time with the little boy, but doesn't think their issues have anything to do with the 'Pretty Hurts' hitmaker.

The former 'Scrubs' actress, who previously claimed Matthew asked her to hand Nixon over to Beyoncé and Jay Z when he was born in February 2010 so they could raise him as their own child, told Inside Edition: "I don't expect Beyoncé to take accountability. It's not her problem. It's not her situation."

Alexsandra said Matthew still owes her $32,000 in court-ordered child support payments, which he denied in December and insisted was merely the result of a paperwork delay.

She added: "I tried everything to not have it public, but unfortunately that's just not the way that Matthew chose to deal with this.

"I'm going to stand up and I'm going to fight, and I'm going to fight the next day because that's the only way to give him his identity."

Matthew married former model Gena Avery in Houston, Texas last July but neither Beyoncé nor her younger sister Solange Knowles, 27, attended the ceremony.

The 'XO' singer, who has a two-year-old daughter Blue Ivy Jay Z, previously hinted that she and Matthew, who split from her mother Tina Knowles in 2009 and divorced her in December 2011 after 31 years of marriage, were still in the process of rebuilding their relationship after they decided he would no longer be her manager in 2011. - Bang Showbiz