I became friends with a daycare mom when I FIRST started out and miraculously,it worked out, almost 3 years later, he daughter is in school and we are still good friends .But,she is an amazing mother and was an amazing daycare mom. I will never ,ever befriend a daycare parent again however. Like the others have said, it can all go very bad,very quickly.
I like to keep it friendly but professional.
If a parent keeps on inviting me over and doesn't get the "hint" I have told them outright that I don't mix business and pleasure. It was awkward, but I had to choice.
I can't wait until my kids are older and not friends with the daycare kids anymore !