This is exactly what I sent out to my families:
Hi All,
I am just sending out an email to everyone so that we are all on the same page. When I first started doing home daycare, it was with the stipulation that I would still be able to be there for my kids. We have been finding that my hours are starting to interfere with homework, dinner and general care of my own children. Therefore, effective immediately, I can no longer provide courtesy services to any family. Effective immediately, my work hours are 7 am to 5 pm. I will be strictly adhering to them. I realize that this may cause problems with some parents, and please know that I do welcome you to make alternate child care arrangements without penalty. I ask that you please understand that my first priority must be with my own family.
Thank you very much for your understanding,
Alphaghetti