I would not have him do y seams for his first quilt. We need to get him "hooked" on quilting first. Just kidding, but seriously we don't want him to get discouraged before he just gets started. Sewplease's technique looks easy and no y seams. The finished quilt is very pretty, too. Have fun teaching and learning at the same time. Teaching my DGD is one of my greatest pleasures. Show us his progress.
Sue