Another thing, since you are on the internet, is to find art projects for pre-schoolers.
For instance, one of the things I learned from my sons’ preschool is to give the child shapes cut out by an adult that the child arranges, decorates and glues down to make a picture. For instance, start with a ream of differently-colored construction paper. You can glue the shape of a Christmas tree to an 8.5 x 11 background, provide lots of “ornament” shapes and also provide glue, stick-on “jewels,” sparkles (yes, 4 year old boys like that kind of stuff, too). Make six or so–all the same or coordinate the shape, but a repeating starting point; your artistic sense can come into this, too! He finishes the six of them and you hang them up. The consistent starting point you gave him gives a consistency to the art pieces, so that when you hang the results as a group they look pretty good no matter what he does. There are lots of seasonal variations you can do on that idea.
I used to hang this kind of art on a pair of glass french doors, because we have twins. The “gallery” idea allows you to switch out his old work for new stuff, rather than having to keep the same art piece on display until he’s 18. When something old has to come down because something new is going up, you send the artwork home, like the school teachers do. (Children are also less resistant to removing “seasonal” art after the season for it is over.)
If you take care of him at your house and you can provide a wall that is set up for “grandchild art” with a section for each grandchild’s art or clippings or whatnot, this both makes it look very important and keeps it contained. Otherwise, the grand kids might cover every surface of your house with art, which can be a bit much. Again–take your cue from the ideas the preschool teachers come up with. They’re an ingenious lot who do a lot with limited resources.
In any event, my rule was to find things I enjoyed to do with my kids…as in, music I liked well enough to hear about 9.000 times, books I loved so much that I wouldn’t get tired reading them, and children’s shows that I thought were charming. If Granny or I didn’t like the show, the children never found out it existed. No Teletubbies at our house–I thought that was the most vapid show ever invented! Granny absolutely vetoed Barney (or, as she called it, “The Purple Thing”). You have to be able to enjoy yourself, too. Don’t be a martyr. It will show and the child will wrongly think it is he who drives you nuts.
(I videotaped the children’s shows and took out the commercials–whole disks full of Bob the Builder or Max and Ruby, etc. This was right after 9-11, so we had the TV on Home and Garden or the Food Network, because we knew when the video ended and the cable channel came back on, there would never be any alarming-looking news that they couldn’t understand. Definitely find a way for TV to revolve around your schedule and not the other way around.)