Don't Disgrace your Parents
When a person commits an aveirah, he is disgracing his parents. Chazal (Kiddushin 30.) "There are three partners in man: Hakadosh Baruch Hu, the father, and the mother." The Rema m'Pano explains that in every person, there is a part of them that is their father and mother. So, when one does an aveirah, he does the aveirah together with his parents. Therefore, in tachanun, we say, עם חטאנו אבותינו, we sinned together with our parents. Furthermore, there is punishment and disgrace for the parents in the next world for the aveiros that their children commit. So, when one commits an aveirah, he must know that he is also affecting his parents.
The Zohar (vol.3 p.115:) states, "A child honors his father with food, drink, and so on. This is in their lifetime. After their demise, the obligation is even greater because if the son goes in bad ways, this will cause disgrace to his parents in heaven. And if the son goes in the correct path and improves his ways, this brings honor to his parents in Gan Eden."
