The quest to determine whether Beyoncé has a half-brother is picking up steam.

The Grammy-winning diva's dad, Matthew Knowles, who was a target of a paternity suit in October, exclusively tells E! News that he will "certainly" submit to a paternity test when asked.

"I know about as much as you do," he says. "Last week, they said it was a girl; this week they said it was a boy. We do have a court date, but none of that means anything until DNA testing is done.

"I'll leave that in the hands of the attorneys," Knowles adds.

Alexsandra Wright, who claims that Knowles fathered her child during an affair that lasted 18 months, gave birth to a son last week. A source told E! she's planning to request that the former Destiny's Child manager take a DNA test, and then, if it's positive, will petition Knowles for child support.

Knowles has denied being Wright's baby daddy and has not offered up any money to date, our source says.

Beyoncé's mother, Tina, filed for divorce from Matthew in December after 29 years of marriage.

—Additional reporting by Lindsay Miller