http://revach.net/article.php?id=1390

Section: Halacha   Category: Tshuvos
Rav Moshe Shternbuch: Standing Up For Your Parents - You Technically Don't Need To, But It Would Be Very Helpful
The Halacha states clearly that one must stand up to full height for their parent's; once in the morning and once in the evening.  Today we are not accustomed to doing this.  Why not?  Rav Moshe Shternbuch writes (3:276) that not only are parents Mochel this kavod but since they don't want to burden their children they prefer that their children do not stand up. 

However he says, in today's society this attitude is harmful and not helpful to raising children.  The nature of today's society instills a disrespect for elders by showing our children that they are far more advanced than their old fashioned parents who are constantly discredited by the new way of doing things.  By being Mochel on the mitzva of standing up we help perpetuate this attitude and miss a golden Chinuch opportunity.  This attitude says Rav Shternbuch leads to children who won't listen to you when do actually demand something of them.

On the other hand, the mitzva of standing up for parents, Rebbeim, or older people carries with it a great segula to imbue us with Yiras Shamayim and respect for experience and age.  By having your children stand up for you you teach them respect and give them the opportunity to do a wonderful mitzva twice a day which is certainly not over burdening them.

He suggests that children should be taught by their father before the age of 5 to stand up twice a day for both their father and mother, explaining to them that this is a zechus and big mitzva.

Important Note: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.