Observations of Children and adult

The interaction between children and adult in American is different compared to my country. I go to my host family for dinner almost every Friday. I found out that, sometimes, my host sister yell back to her mother and father. As my country's culture, the childeren should not shout back to the elders, especially the parents. If the elders or the parents misunderstand the young, the children should talk in an appropriate way politely. We considered shouting back to the elders as a rude manner. Also, it will be the big sin if you are a Buddhist.