Do you know what kind of hobbies the kids have at all? I would definitely take that into consideration for what you get them. Maybe if one of them is into music you could get them some kind of instrument to help drive them more into that, or if one of them is into painting or drawing you could get them some nice quality supplies to help further that as a passion?

You could also always get them some new clothes or supplies that they couldn't normally afford, though I know you're saying you'd like to get something to try and inspire them. Maybe you just giving a helping hand to make sure they have what they need could inspire them to learn to do the same for others in need in the future though. I know when I was a teenager we were broke as hell and I really started to appreciate whenever I get some new clothes as I was wearing some ratty ass stuff for a long time.

Either way, bro. This is very generous, awesome and just downright great of you to do and I hope you can find some great stuff to gift that family. Keep up the badass work, man!