Pop singer Jessica Simpson’s father is suing a California man, claiming he tried to extort $12 million from his family over the multimillion-dollar sale of his daughter’s retail brand.

Joe Simpson admits that agent Jeffrey Bowler tried to put together an endorsement deal in 2010 for a makeup-products line, but says it “died on the vine.”

Last week, a lawyer for Bowler sent a letter to Joe Simpson threatening to pull the entire Simpson family into an embarrassing lawsuit in Los Angeles Superior Court if he didn’t give Bowler a 10 percent cut of what he says was a $120 million deal.

Bowler’s lawyer, Gregory Smith, declined to comment.

This article originally appeared in the New York Post's Page Six.