@Cycloptichorn,
I might, or might not, say the opposite re cyclo's comments.
I took piano lessons from nine through thirteen and lost any impetus to want to practice... except that I liked the piano by myself sometimes. This can be separated as an odd circumstance, as I was bored out of my tree, or maybe not. My lessons were in a convent front room by what I can only take now as a non swift sister.. with a non swift me. Within the year of my being thirteen, we moved to California, and my parents, bless 'em, asked me if I wanted to have the piano follow us, and I said no. I was cognizant, somewhat, of expenses and the trouble we were in, and also honest, in that I was tired of that structure. It turned out to be a good decision, as we had increasing family money straits up the wazoo. The baby grand, old and used of course, would have had to have gone into my aunt's garage with all the black widows. From my viewpoint now, it's a wonder they asked.
I see that these kind of straits are not your problem, boomer, but I think you have to look at what is going on here. You clearly want Mo to progress. I'm not clear that more drumming is the route.
I would still like to have a piano, but I was never sharp or flat enough to be a pianist. (I'd like to hear more about Thomas on this.)