I'm gonna murder someone

Ladies I'm at the end of my patience. My husband dad lives with us cause he's a hot mess and my husband is afraid of his dad getting depressed etc. Well let me tell you, this man is a disgusting human being, he coughs and whatever comes up he spits it on the floor 🤢, he showers once a month, he literally drinks all day everyday and today I'm about to kill him. I went for a walk before getting my workout on, come home, I'm doing my thing he doesn't notice me on the dining room and he whips out his nasty dick and fucking piss in the kitchen sink! I had to do a double take cause I couldn't believe my eyes! he notice me after and try to act like he was washing something, I was bitch you took your dick out and pissed. I go upstairs and just yell at my husband cause I'm done, I'm about to leave cause I can't deal with this shit. My husband uses the excuse that his dad is sick blah blah but that no excuse to being a fucking disgusting man. Any advice? He's 53 I don't think is dementia he's just disgusting. Also he peed in the kitchen sink. #Hes lucid he doesn't have dementia, he goes to the doctor regulary, hes just disgusting, my husban brother is in London and the sister is going to college. I can't take it anymore is either him or me.