Budget, Family Wishes, Family Time

My son wants to learn to play piano. All we have is an electric keyboard (it is a pretty big one but it doesn't have all the keys the way a piano would). I'm not sure he can learn on that very well. He could get the basics but then he'd want a piano, which we can't afford. I would like a piano, which we can't afford. I'd also like a bigger house to put it in so let's just dream big (while keeping in mind WE CAN'T AFFORD IT).

I'm wondering if he wants to play piano because the cute girl at school teaches.