From The Strad, 12 ways to encourage children to practice. These are almost all things that Suzuki parents do naturally.

I should work on #7:

Encourage small-section rather than whole-piece practice.

We tend to do that with the most recent working pieces; but we could do more review by focusing on the technically-demanding parts more often. After all, review isn’t solely for the benefit of knowing the pieces. The pieces are there to build ability.