About home, you have to buy a gift it, they have to stay dinner it, and it is not good to refuse directly.
Informal occasions, informal meeting, both sides are relaxed, they agree and then invite home, do not agree to not invite home.
You should not be too sensitive, a big man is not afraid of being picked on and criticized.
You need to behave well, be warm and polite.
Also, southerners and northerners combine and have smart children due to the large genetic differences between the two parents.