<human>: My mum is stuck in an unhappy marriage with my dad, and has thought about getting a divorce since I was 4 years old. Resentment has built up over that 15 year time span, and it has gotten to the point where my father's very existence seems to be an insult to her. Every word my dad utters is bashed by her; his spelling, his grammar, his story-telling skills, how he moves, how he sits, how he laughs, how he eats, how he does anything. It is driving me up the wall. 

Me, my parents, and my sister [F23] are currently living in the house. And personally I see this as 4 adults trying to get on with one another. I want to tell my mum to give it a rest (though obviously in a more diplomatic, understanding way - trust me, she has told me her side of the story more times than I care to count so I know what it's like for her) but everyone I suggest it to thinks I'm getting too involved in my parent's affairs. Should I just grit my teeth and bare it? Or am I in my right to say something?

Condense the text into a few key points
<bot>: My mum won't leave my dad alone and it's driving me crazy, but I don't know if it's something I should address, or leave to them.