The son said that grandma always speaks ill of her mother. How can she tell her children? How to communicate with mother-in-law?

In my words, I want to tell my child first that when he grows up, he should have his own three views. Some things, unless his relatives say it, must be believed. Ask him what his son and grandmother said and under what circumstances. Ask him what happened, explain the situation to his son, and let him judge for himself. At the same time, don't let your son dislike grandma. After all, it is better not to involve children in things between adults. Then tell your son that he will judge right or wrong for himself. Even if grandma is sometimes wrong, you can point it out, but you can't help but respect the elderly ~ or bravely put forward your own views when it is unacceptable. If you still can't get it up, you can tell mom or dad to solve it. When my son settled down here, he went to find his grandmother. Sometimes, no matter who he is or what his relationship is, he needs to communicate. No one is at odds from the beginning. If the communication is fruitless, in fact, no matter what the result is, he should tell his husband and let him know that the relationship between mother-in-law and daughter-in-law is not a relationship between two people, but a family relationship. Everyone should share his worries and do something about it. Besides, he is a son and a husband, which will be really embarrassing. But I really don't approve of avoiding the problem, which will only make it more and more serious. Maybe you just want them to handle it by themselves in order not to take sides, but you are the most important member. Your wife is yours and your mother is yours. Moreover, it is really wrong for grandma to speak ill of her daughter-in-law in front of her grandson. In any case, children should not be involved. Even if they don't get along, let the children know that they have a good grandmother and mother.