Can't flush his own shit

I've been staying with my parents while waiting for our baby to be born (I'm 37+3) because my husband is attending school 3 hours away and I like the OB that I have here. I'll be able to get help from family for a few weeks before moving back up with my husband. Well our son (2.5) and I came up to visit with him for the weekend. We drove the 3.5 hours. First thing I notice when we pull up is all my outside plants are totally dead. I specifically asked him to water them everyday and he said he would. Guess not. The second thing i notice is the front door isn't locked. The backdoor isn't either. Wtf?? The third thing i notice is a huge wave of fucking putrid stench. Like disgusting smell. I walk around the house trying to find the source and it's coming from our front bathroom. There was a massive diarrhea shit just sitting in there. My husband and I have had this talk SO MANY TIMES THAT I CANNOT EVEN COUNT THE TIMES. He never flushes his fucking shit and then I always find it. Well who fucking knows how long this one has been sitting in there. Like it's 100+ degrees outside so the CHA unit doesn't keep up great so of course the house is going to be hot during the day. I'm so disgusted. This is the type of shit that makes me not want to come back. 🤢🤢🤢