Did you already looked up for a place in a good childrens home?
Keep in mind, they might chose your elders home later.
I mean, if they start to paint on the Display, it is serious.
If i remember well, there exist some sort of Foils which can be temporarily
glued onto surfaces and removed flawless.
That way you can preserve their Artworks
without to damage the devices surface.
OTOH: Sell it on Ebay, after you shared it on deviant art.
Money makes the world go around. ( the better kind of motivation, i think)