"My wife refuses to stay with my parents in the same house"

Query: My wife doesn't want to live with my parents and so we live separately. But I don't want my parents to live in our old, tiny house. My wife shouts and behaves badly whenever my parents are not there and she back-bites all the time. But when my parents are there, she behaves like the perfect daughter-in-law. How can I ask my wife to be more understanding?