Adult Dog Needs To Be Re-potty Trained… Help!?

I have a two and a half year old papillon. I recently moved back in with my parents. Ever since we moved in their home she wont stop going to the bathroom in the house. At my house she was fine and always went out side. But now no matter how many times we let her out side she still goes in. She will come in from out side and then with in minuets go in the house. At my parents house she has a much bigger back yard, and often likes to go out side. Any suggestions? Thanks!