NY- A wealthy Manhattan real estate broker claims his wife turned tricks in their apartment - and poured his dough into a Hong Kong brothel.

Adding insult to injury, John Ackerman charges in divorce papers that Annie Yau taught their 4-year-old son to address him in what he thought were Chinese endearments.

Later, Ackerman learned his son was calling him a "f------ jerk" and telling him, "You are stupid because your wife is sleeping with other men."

Ackerman, 48, said that when he confronted Yau, she thought it was all "very funny," according to court papers filed in Manhattan Supreme Court.

"I really don't know who this woman is anymore," Ackerman told the Daily News last night.

Yau, 30, a Chinese antiques dealer who now lives in Queens, and Ackerman were married in 2001, two months after meeting in Hong Kong. He said her friends later told him Yau married him only to get a green card.

Ackerman set up his wife in the Annie Yau Gallery on the upper West Side, but said the relationship quickly soured.

He claims in the court papers his wife "engaged in prostitution" in the "marital home" from 2002 to April 2004 while he was at work.

Yau used $1 million of Ackerman's money to buy an apartment, buy cheap antiques and "to invest in or purchase" a brothel in Hong Kong, the papers state.

Ackerman claims the slightly built woman roughed him up when he balked at giving her more money - and threatened he would never see their son again. She and her lawyer declined to comment yesterday.

"The good thing is that I have a wonderful, beautiful son out of all this," Ackerman said. "The sad thing is that he is caught up in the middle of this."