My kids spent 8 nights with grandparents last week while my husband and I went on vacation! Reports are that my 6 year old son was very difficult throughout the week...not listening, arguing, lying, the works! I know to some degree I have to let it go - he was not under my care and I know rules were not consistenly enforced. However, he knows to behave better than that and was completely taking advantage of the situation. Should I make his apologize and leave it at that or have some consequences now that we are home?