Kibud Av V'Em

One should be very careful in honoring one's parents as the Torah compares honoring one's parents to honoring Hashem. There's two parts to this mitzvah: 1)Honoring one's parents (Kibud Av V'Em) and 2) Having awe for one's parents (Moreh Av V'Em)

Honoring one's parents

1. Including in honoring one's parents is feeding, dressing, and helping them walk. When one is doing such an activity, one should do it with a smile.
2. One must stand before one's mother and father unless they forgo this honor.
3. If one sees one's parent do a sin, one shouldn't say "you sinned" but rather "father, doesn't it say in Torah such and such?" in a question form and the parent will understand and not be embarrassed.
4. If one's parents tells them to violate a Biblical or even a rabbinic prohibition, one shouldn't listen to one's parent.

Having awe for one's parents

1. One shouldn't stand in the place where one's father usually stands to daven or sit in the place he usually sits at home.
2. One may not contradict his words or even say that one agrees with his words in front of him.