I would not be asking parents about this. I would just do what I wanted to do. Now, you say you charged them a higher rate because you had less kids in care. So, offer them a reduced rate based on your new business plan and they can basically take it or leave it.

This is something I always caution new providers about - making promises to first clients that, as you evolve as a provider, you are not going to be able to keep based on changes in your business plan as you grown and become more experienced.