What should I do if I find an ambiguous message in my mother's mobile phone?

First of all, as a mother, there must be some problems in the relationship between husband and wife, and I will do that for various reasons! Your sister is in high school. I believe your mother is 42 years old. For women of this age, they are generally looking for feelings that your father can't give! You can communicate well with your mother, but you must be tactful and not expose it directly. As a mother, it must be embarrassing for her daughter to know such a thing. Then you have to find the problem. Then solve the problem. Secondly, as daughters, you two must look at the problem in the same way and see what the problem is! If a mother loves her family, she won't divorce easily! Your father must not know about it, so things will get out of hand. But the mother's practice must be communicated and euphemistic. Generally speaking, your mother knows what she will do if she does that. The key is your speaking skills.