I found out that my father had a lover (mistress) and had been in love for several years. What should we do?

As an adult, you should talk openly with your father about this topic and ask him what he really thinks, whether he really loves this woman, or whether there are any misunderstandings and reasons. Don't guess for yourself. If dad is honest with you, really loves that woman or can't answer, you can basically conclude his feelings for that woman, and parents as children don't have much right to interfere. Is it happy to lock a person whose heart is not at home here for dinner? Because you, the strange strange bedfellows, tied mom and dad to a bed, it is even more torture for your mother ... If everyone can solve this matter calmly, you should not delay your mother's pursuit of another kind of happiness. Of course, what I said is based on the fact that your father really wants to leave this family, but if your father just plays outside, it's not a big problem, but you still have to warn him to think from the standpoint of his mother and this family, and don't do these things too blatantly, okay? I am a post-90 s generation, and I am very calm about the topic of divorce. If my parents really don't get along, or something, I will let them pursue what is right, just as I don't want them to stop me from pursuing my own happiness. I hope you can relax. Actually, it's not a big deal to have an affair, a mistress or a divorce. Just open your heart and make it clear. Don't fight the belly lawsuit alone. I hope you can come out. !