I am babysitting my nieces kids for her (free of charge) for two months while she saves up the deposit needed to place the youngest two of her four kids in day care next school year... and while I've had a hand in raising her first three kids over the last two years I have to say that I am getting a little stressed at the oldest child (7 yr old boy) that is getting out hand - he is becoming defiant of any authority figure in his life... it has gotten so bad that his dentist (a child specialist) informed me today at his check up that if he continues to behave as he did in the office today that he will no longer be allowed back.

The child has his good days and his bad days and while I can understand some of his anger due to the absence of a father in his life - I cannot tolerate such actions for both his mine and his families sake.

I would appreciate any advice of what has helped other parents deal with an out right defiant child.

Thank you.