Nicki Minaj's Brother found Guilty in Child rape case, could face up to 25 years in prison.

Nicki Minaj's brother was just found guilty in his child rape trial reports TMZ ... a case that lasted nearly 3 weeks.

The verdict for Jelani Maraj came in Thursday in Long Island ... he was found guilty of predatory sexual assault against a child and endangering the welfare of a child. He faces 25 years to life in prison. He'll be sentenced on December 14. Nassau County D.A. Madeline Singas tells TMZ ... "We hope that today's verdict will help the family in the healing process."

Investigators wrote in court documents that the victim was younger than 13 and that Maraj raped the child several times. Some details in the court documents were blacked-out by a judge. Nicki Minaj, who won two American Music Awards this year for favorite artist and album-rap/hip-hop, did not immediately comment through a representative.

Minaj, for her part, has yet to comment on her brother's arrest or on the reports that she bailed him out of jail, but this is not the first time she's had his back. Back in August, she reportedly footed the bill for his wedding to longtime girlfriend Jacqueline Robinson.