I really don't know what to do going forward as I am furious with ‘D’P.
My 14yo DS was complaining of a stomach ache and feeling sick on Thursday. I still sent him to school as he hadn't actually been sick. He was the same Friday and school sent him home at lunchtime as he had been sick. He seemed unwell but I wasn't too concerned as I assumed he had a bug. He was being sick all day yesterday but he was drinking so I still wasn't worried. DP went out drinking at around 8pm, then at 10pm DS told me he couldn’t stand up and was crying because his stomach pain had gotten worse. He later said he could stand up but didn't want to due to the pain. I was very worried and called 999 due to how the pain had gotten worse.
I also have a 6yo so I tried to call DP to no answer so in the end I called BIL and asked him to watch DS2. BIL told me he'd try to call DP so I could focus on DS1. He needed emergency surgery due to his appendix bursting. It's now the next morning and I still haven't heard from DP, BIL managed to speak to him and said he seemed very drunk, he told him about DS1 and he just replied that he's probably fine (without even asking me how he is).