The fifth commandment shifts the focus of the first 4 commandments away from God toward human relationships and responsibilities. Additional passages about parents can be found in Exodus 21:15, Exodus 21:17, and Leviticus 20:9.
This commandment points to the blessing of being in harmony with the divine order. In the family we learn about commitments to make and how to make them. We learn by observing our elders. Early Christians believed that whoever did not honor their family members had denied their faith and became whose than an unbeliever. (I Timothy 5:8)
How will your children treat you when you are old? They will likely do what you did to your parents.