When I signed my children up with our past child care provider I signed a contract and gave permission for her to use photos of my children for personal/promotional use etc. Now that they are no longer attending this day care, I wish to revoke that permission - there are currently pictures on her website/ads of my little ones and I in no way want to be affiliated with her day care/have my children's pictures included.

My question - is writing a simple e-mail requesting she take them down and letting her know that effective immediately she no longer has my permission to use any pictures of my children sufficient to make this part of our contract void?

Thanks in advance for your comments/advice.