I really do try to teach my children manners, but they don't always say please and thank you. One of my dd's friends (they are both 5) always says please and thank you and is very polite. Her 18 month old sister says thank you too! I asked her mum what she did to raise such a polite children and she says she just encouraged manners very early (from the start) and will remind her every time she forgets. It obviously works, but seems a bit over the top. Should I be doing the same thing? What are your experiences?