Thanks for posting a picture of the "Breaking Home Ties" painting. We sent our oldest son off to college a few months back. Except for the clothing the young man in the picture is wearing and the Dad smoking a cigarette (I quit 5 years ago), that could be my son and me! Our dog would rest his head on my son's lap too! It was hard sending our son off, we really miss him, but that's what a parent's job is, to raise them up well and send them off into the world.
I know exactly what you mean. The final parting I made from my parents home after graduating from college to move far away was very difficult. My Mom was sobbing openly and my Dad and I were teary eyed but trying to remain brave. Several days later, my parents wrote me and told me it was one of the saddest days of their lives.
Many years later, near the end of my Dads life, I had the pleasure of making audio recordings of his narration of important events in his life and we revisited that day I left home. I was surprised and elated to discover he remembered the day not with sadness, but with great joy and pride. My life had been filled with blessings and excitement that I shared with him throughout. He remembered the day of our parting only as the joyful beginning of my adventure.
I hope that God grants a similar happy remembrance of this difficult time of parting to you and your son.
I used to tell my son when he was younger that I was going to get a chip implanted in him so that if he started to wander too far, he'd feel this irresistible urge to come home lol. He loves to travel, as do I, and it is entirely possible his destiny lies in another, and distant, land. I have come to terms with it; it's much easier to do when they have established themselves, than it is to think about being able to do when they are young and necessarily dependent on you.