It gets me down so much. My Mum and Dad have been unhappily married for more than 30 years now. My Dad treats my Mum like trash. About 20 years ago I begged them both separately to split up. They didn't. I dread spending time with them. They're OK ish on their own. (My Dad is still difficult but less abusive).
They're in their 70s now. Christmas day was just about bearable but I had to go for a long walk to the end of the street to calm down because of the comments my Dad made. They're at the beginning of their proper old age now with health issues cropping up. Their care will ultimately be my responsibility and I am utterly utterly dreading it. That's if they get there. I often wonder if sirens I hear are in their way to my parents house.