All of us learn through imitation. Our little girl and boy always begin with “please” and close with “thank you.” We lead by example. And, we always need to remember to be consistent in our behavior, especially in front of our kids. You might find this Q&A helpful --
http://bit.ly/29qHGyH. It talks about how you can teach your children to be respectful. I also have a great book suggestion if you think it would be useful. It’s titled, Raising Kids with Good Manners, by Donna Jones. You can check it out here --
http://bit.ly/29yLcVS. I wish you the best.