Awash in a Sea of Pee

I don't know what to do about this problem we're having. Quincy was a late potty trainer, like 2 months ago late. He'll be 4 in November. He still wears pull-ups at night and I'm fine with that. I understand if he has occasional accidents. He doesn't have it all down yet, but he does know when he needs to go. He just gets up and goes at school. He has come home both times he's been there in the same clothes that he arrived in. My husband says this is because we told him that no one would like him if he smelled like pee and poop all the time. I don't think so.

So what's up with the peeing in my floor and in my mother's floor? I have two wet pairs of training pants from my mom's tonight and he was only there about 4 and a half hours. He peed twice in the same spot, after she told him to go to the potty and try. And that doesn't hold a candle to last night.

Last night was my night off. My one night to spend with Quincy. My one supposedly pleasant night. I'm sick. It kind of sucked. That's not the only reason though. He peed three times in my floor. Three! I even left his training pants off so he would just have to run to the potty and sit down or stand up and go. He even peed yesterday while we were out shopping at Sam's in the bathroom there, so he had a good day until about 5 p.m. That was when all the accidents started. Two of them were genuine accidents. He was playing, he started for the potty, got distracted, and didn't get there in time. Once though, I looked up because I heard the telltale splash on my wood floor and there he was with his shirt pulled up so he would not pee on it, moving himself back and forth so as to cover the largest area (I guess). That one did not look like an accident to me.

I'm not sure what to do about this except to backtrack and take him to the potty and make him sit down and try at set times. I have to be more vigilant about making him clean up his accidents also. I feel like he's old enough for that. Any suggestions?