A Manhattan judge who handles high-profile business disputes told the parties in a real-life “The War of the Roses” to keep their family feud in divorce court.

Former Giuliani administration City Planning Commissioner Joseph Rose filed a commercial lawsuit last month against his soon-to-be-ex-father-in-law, Marshall Rose, claiming Marshall hijacked his e-mail, froze him out of transactions and fired him as retaliation for divorcing his daughter.

But Justice Jeffrey Oing said Joseph’s “spite” suit belongs to a matrimonial judge.

“I’m not going to get mixed up in this,” he said.

Oing declined to reinstate Joseph to his position at Marshall’s real-estate firm, Georgetown Company, saying the former commissioner cut a bad business deal by signing an agreement with the firm that gave his father-in-law “unfettered” authority to make decisions.

Joseph and Marshall’s daughter, Wendi, are going through a bitter divorce similar to the one portrayed in the 1989 film “The War of the Roses” starring Michael Douglass and Kathleen Turner.