Last night, we got a phone call late in the evening. We were all preparing for sleeping. I picked up the phone. It was a Chinese lady who was trying to sale Dish Network TV service. I told her in Chinese "对不起, 现在很晚, 我们要睡觉了" and then I hang up the phone. Basically, translating into English it meant "Excuse us, it is too late, we need to go to sleep". 对不起 could meant " excuse us or sorry. Then I heard my wife told my kids something like "He was silly to say sorry". Audrey did not say anything. I hope the kids know what is called polite.