Why do some relatives, who don't let you know anything about them, always want to know you, and they have to get to the bottom of what they hear?

Relatives at home are curious and want to know about other people's families, but he doesn't talk about his own. In fact, this kind of situation is more common around us. The best way is to find a way to change the subject, so that there can be less entanglement. Or you can express it euphemistically, for example, I don't know much about this matter, which can avoid a lot of trouble.