It's a matter of excitement. Painting with Daddy is something that I started aggressively with my girls when they were 2 and 3 respectively. I have a LOT of rainbow gladiators, gnomes, horses, and plastic army guys/cowboys. It's how they learn.
It's only been recently (ages 5 and soon to be 7) that they do a good job of blocking, and this year that I introduced a simple wash and even simpler dry brush technique.

(L-R) Maja (age 6), Daddy, Millie (age 5)
http://gamingwiththegnomies.blogspot.com/2016/02/millies-chupacabra-and-schutztruppe.htmlWe've been grabbing Bones when they get restocked at the FLGS and the girls are hoping to start detailing some dragon hatchlings.
Hopefully, my wife will know where all of us our on the weekends, no wild parties, just down in the basement along the painting bench.