Shabbath Shalom

First four  mandments focus on relationships between man* and G-d 
Numbers six through ten focus on relationships between man* and man* 
The fifth commandment says we should honor parents. They are G-d’s partners
From the URJ Torah Commentary (Revised Edition) … “Jewish tradition has underscored the importance of one’s duty to honor father and mother by listing it among the commandments on the first tablet. It is thus seen as concluding the catalog of basic obligations to G-d. Parents are G-d’s representatives and partners in rearing of their children; and children who fail to respect this special position are offending against G-d as well.” (pg 495)
*Poetic license … “man” refers to humans of all genders