Not if I run away .. LOL
The worse part is trying to be nice without upsetting these parents
The worse case .. I'm thinking after a fews days in my house all day long with MY rules .. these kids won't like staying here all summer :0)
Don't worry about being "nice." Just be honest. Tell them that your children didn't ask you first and that your family already had plans for the summer, then offer to take up the slack if they get in a bind with whoever does babysit.