Hi and welcome Soaring,
Have your grandkids been evaluated by any professional?
Any diagnoses?
Are they receiving services from the state or locality?
If they haven't, you might start with your local school district for evaluations.
If they have services in place or diagnoses, let us know (to the extent you feel comfortable) what these are, as more info could help to guide you in your next step.
Please stick around, as there are many helpful people here, and it is a great place just to talk with people who are in, or have been in, similar situations.
Apple