For the kids do you need a I'd or can it be a school id

Yes each person riding must have an ID or provide one and it must be current

If your child is a US citizen and that is under the age 17 accompied by a parent or guardian they do not require an ID, but always good to have one on hand otherwise yes.

If your kid is under 18 you don't need an ID as long as you are flying domestically

Wherever you go, even children need ID