I like mixing it up...but right now I'm training every body part once a week, besides calves, forearms, and abs, which i work twice a week...because they don't handle as much weight... Do what works for you...I know you've heard it before, but I'll say it again...

"Everyone's different"

BTW...How cool of you and your son to be in on this together..Shows good bonding if you ask me...