I went through this situation with a good friend a couple of years ago. I am one who has a really hard time saying no to people, but in this case, I knew I had to. My girlfriend's Nanny quit, so she was stuck. Knowing that I was a stay at home mom, she asked me to take over until she had another nanny. I said yes. Now mind you, I am not crazy about her little girl, can you say spoiled brat? lol I had my usual routine with my 2 girls, so it did disrupt that. I found it a lot harder with 3, I think only because this child had no dicipline at home, so she thought she could have the run of the hous at my home. Not the case. 2 weeks went by, and it seemed my friend was no closer to finding anyone. I knew I had to go to her because I didn't want our friendship ruined over this. She was extending the times, adding a day here and there and I was begining to get resentful and it was driving my husband crazy. I made up a little fib. I told her we all had dr.'s appointments the next week and would be unable to watch her daughter. She took that okay, and hired a babysitter in the mean time. She didn't ask after that, I think she knew. We did manage to keep the friendship and she gets to keep her daughter! lol If you do decide to do it, make sure you have definite hours, definite pay rate, what happens if they are running late, if their child is sick, they shouldn't bring them over or your children could catch it. Just have all your ducks in a row! Best of luck.