WR, I would ask about both and explain that you need the money to help purchase the children clothes and pay for the children's medical and school expenses. Make the request all about your children.
He is their father and you shouldn't be questioning whether to ask him for the money or not. Send an email for documentation and continue to document each and every request/response to his requests. It's time to move this right along to the lawyer and advise him/her that you need temporary child support until the papers are signed.
As for the paperwork at the school, you've done the right thing and it will be on him to pick the papers up. You've done what you can to keep him in the loop and as I see it, you don't have anything to worry about w/this matter.
Now, breathe, send your email one last time and go from there.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
