Bless your heart. I'm sorry to hear about your other half, it must be very hard for all of you .... I wonder if a timetable might be a start so your children can cross things off a list and be more focused on that, than fighting with each other? Maybe things they can do separately so that they don't get on each others nerves? I think the rewards would have to be praise and cuddles, but perhaps they can receive some sort of token (buttons, something like that) that they collect after each successful day and then exchange those tokens for something they can make/create/paint at the end of each week? Something like gem-art, which takes a bit of concentration, or a colouring book, get yourself one too... you can all sit together on Saturday afternoon, talk about what's going on, it might take a while to get them to open up, if they've been holding their real emotions in, but it's a lovely way to spend an afternoon... Good luck - I hope you find a solution and some peace too xx ❤