here is update!
The contract package that parents sign states that my handbook/contract can be revised/changed at anytime, but all amendments must be signed by parents and I up to thirty days after the new copy of the handbook has been given out to them by me.

I give them them one week before the thirty days start to ask any questions to so technically they have 35 days to dispute or pull thier little one...

She complained after she signed the paper that states....

"I/we fully understabd and agree to the changes made within this handbook."