My fiancé gives his mum $1500 each month to support her. She is from overseas but lives here with her daughter. He doesn’t like it when I ask questions or ask why. He also pays for her medical bills. She is from overseas. He does have siblings also but feels like it is his responsibility to help. I don’t know what to do and whether to just accept it. He told me I’m not allowed to ask what his mother is spending it on and that’s her salary. He is responsible for her.