Our four-year-old has been exhibiting poor manners lately. He has been reluctant to say thank you when people give him things. Plus, we had company a couple of times this weekend, and both times he refused to say "goodbye" or "thank you for coming" when they left. I think for the most part he is just pushing boundaries and establishing his independence, but my husband and I have agreed that we need to do something about this. It's terribly rude, especially when we have guests in our home. We've tried explaining to him why saying thank you is important and why it is important to make our guests feel welcome and appreciated, but that has not seemed to help. Any suggestions?