What do you say to your mom when your mom and dad is having no good relationship?

I told my mom to separated. I mean.. she isn't happy with my dad obviously. I can't imagine how much pain she has to bear. do you think my mom should separated from my dad? what would you do if your mom is not happy with your dad? would you tell your mom to divorce?

What do you say to your mom when your mom and dad is having no good relationship?
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