As far as the money, may be you could sell the gifts and open savings accounts. If they have money now, enough to feed and cloth them, the money will come in handy later after high school. I doubt they can save money now and they will appreciate your gift later.
As far as doing something to help them, I agree with contacting them directly to let them know you care. They definitely need love and support right now.
The school might already be aware of their situation but if not, sending them a letter is a good idea. IMO it is always better to do an act of kindness than not in these situations.
:grouphug: Good for you for trying to help!!