Ex husband hit by train!

This may be long so bare with me. So a little back story. My ex husband was my high school sweetheart, we had our son at 18, and he left to the Marine Corp, he served 4 year and got out during that time we got married and he left for duty overseas. Once he was out we moved back home and bought a house and got pregnant with our daughter. During the time that he was out he began to take pills. I didn’t think much of it because I didn’t know how bad it was. Well he decided to take a job overseas that paid really well, so we agreed he would work out there and we would pay off all our bills and be debt free and once that would happen he would come home, he would come home once a month to visit. During his visits home I knew something was off, he became abusive mentally and physically and when he was home he would be out partying. I also found a big stash of pills and when I confronted him he became very angry and hit me. I told myself I couldn’t do it anymore , and to be honest we grew apart with him being away I wasn’t in love with him. I loved him for all he had done, but I couldn’t do it anymore, so I told him I wanted a divorce. We were married 6 years and together since 10th grade. So he filled for divorce and I agreed to everything he wanted because I knew the minute it was all over we would probably never hear from him again. I was somewhat correct he would come around occasionally to see his kids, but that eventually stopped. So fast forward a year after I meet this guys through a family member. At this time I’m not really looking for a relationship, but over time we end up dating and getting pregnant, so me and my kids move to Texas ( best decision I ever made). This man loved my children like his own and has raised them like his own without a question. We have never received child support he owes over 100,000. I tried getting it, but my ex turned to heroin and his life went down hill and we never knew where he was, so we just gave up with trying to get it. My kids were better off anyway. So my kids are now 17,12 and haven’t heard or seen their dad since they were like 10 and 5 and my now husband has raised them for the past 7 years. We now have a daughter and son together and he is the best man I could ask for. Well this past September we get a call from my ex husband sister and she tells me he has been hit by a train. From what they said he laid down on the tracks and the train hit him, by the grace of God he lived. He lost a leg and is a quadriplegic. When we asked my kids if the wanted to see him they didn’t want to his family was angry that I didn’t take them, but I wasn’t about to put my kids through that especially since they hadn’t seen him in years my daughter doesn’t even know him. His family also hasn’t seen them or contacted them in years. So today Father’s Day one of his sisters contact me to ask for my address and my kids social security numbers because he wants them to get his disability benefits. Do you think I should do it and get his benefits for my kids or just say no thanks?