Paying Back Child Support?

My ex had custody and was receiving foodstamps and a medical card from jobs and Family Services. My license was taken away for not being able to pay back child support. Unfortunately he passed away 2 weeks ago and the 2 children are living with me. I called the child support office and they are closing his case. My questions are, will they let me get my driver's license reinstated so I can take the children to school and my 2nd question is, even though they're closing the case will I still owe the state for them being on foodstamps and receiving medical cards?

I am low income myself and on SSI and have custody of my 4 yr old autistic grandson who also is disabled and receiving SSI for his disability. We are poor people and I need my license back more than ever, I have no idea how I am going to support all of us and have to pay back child support to the state even though the father has passed.