My wife often tells her husband that her husband's family is so poor. My son has never heard from his family that his wife is so bad. This is really his wife.

There is nothing good about it. The key is you. When your wife says that your family is poor, you should object. In the meantime, don't take a message. You should also remember not to speak ill of your wife and family. In this way, the atmosphere in your home will gradually improve. Daughter-in-law will not say anything when she sees your objection. Guide her not to say, but to say yes.