Mariah Carey — Reunion Stunner With Nick Cannon

Mariah Carey has brought her boy toy, choreographer Bryan Tanaka, into her home with her twin children, and that doesn't sit well with her former father-in-law, James Cannon — who’s holding out hope that Nick and Mariah might reunite!

“I haven’t met Bryan,” James (right, with Nick) exclusively told The National ENQUIRER. “But I would say to my son, ‘Don’t let him come and go as he pleases in your house! “‘Someone you don’t know, with your kids — are you crazy?’”

Nick and the frequently troubled Mariah were married from 2008 to 2016. They have joint custody of son Moroccan and daughter Monroe, and have “a good co-parenting relationship,” said James, a TV evangelist.

Both have moved on to new relationships, with former "America's Got Talent" host Nick now dating beauty queen Brittany Bell (right) and Mariah nearly marrying billionaire James Packer — a man who Nick’s dad called “a knucklehead.”

“Brittany is the biggest relationship Nick’s had since Mariah,” James said. “Packer may have just been the way to get over her relationship [with Nick].”

He said Nick and Mariah “could have been a power couple.” “People say they’re never going to get married again,” he added. “I don’t get involved, but you never say never. They could be like Beyoncé and Jay-Z!”