<human>: Give me a shortened version of the text

My parents have been together for over 30 years, but it's not always been plain sailing (they're very open about their breakups before they got married, and when I was younger I remember them going to marriage counselling). But recently they've been worse than ever, my mum started sleeping in my old room and they barely speak (don't fight much but that's because they don't talk enough to fight). Believe it or not, what sparked this recent deterioration was my dad going to the cinema with other people who weren't my mum, I get why that might be upsetting but I don't think worth this reaction.

I have a younger brother (14, still lives at home) and sister (19, lives part time at home), and I have moved out but still go home for a few days quite regularly. I don't know if my brother has realised what's going on, my sister certainly knows. I totally accept if they want to get a divorce, but they won't do anything to either make the relationship better or get a divorce. 

I spoke to my mum about it and she said she 'knows' my dad doesn't care enough to go back to counselling But she's not actually asked him). I think it's more likely that my dad feels too awkward and nervous to bring it up, as he's not a very social guy. My question is what I could do to encourage them to do something to make themselves happier (even if that means getting a divorce), or if I should just stay out of it.
<bot>: My parents are being totally dysfunctional, refusing to speak about it and each assuming the other one doesn't care. Is there anything I can/should do, e.g. encourage them to go to marriage counselling?