My twentysomething sons & I still spend plenty of time together in the outdoors - an annual highly-anticipated-by-all weeklong elk or deer hunt together, lots of summer hiking and camping & winter skiing/snowboarding, target/range shooting, ect. - occasionally even a bird hunt or fishing trip together (though wingshooting or fishing are no longer the top of either one of their totem poles like they are for me)...This does not take into account all of the non-hunting or non-outdoor pursuits we do together (my sons & I are very close).
I also have MANY other hunting buddies collected throughout my 50 yrs on this earth, BUT as I have already posted earlier NONE of these people (family or friend) has even the slightest inkling of either passion or patience necessary to truly help-out even occasionally with dog-training...I still rely on my fellow bird-dog aficionados/"nuts" for that - you know the type, the kind of guys who could even if necessary be perfectly-happy & fully-satisfied just working the dog & letting somebody else do most of the shooting! THIS is the only kind of person who will ever be of any CONSISTENT help in tedious & repetitive dog training issues!
Personally, I get a lot of pleasure, relaxation & stress-relief from a few minutes to an hour spent dog-training before or after work even during the off-season! Plain & simple, a person has to have some kind of love for dogs & training or they won't do it or even volunteer to help-out much with it period (I have the same total lack of gusto for golf, basketball & shopping - & no amount of cajoling or money on earth could put my heart in it)!!!
My two cents: Let everybody be who they are & share in the overlap every chance you can! I taught my sons to hunt, fish, hike, camp, canoe, play baseball, ect., ect. alongside me with many great memories for all...But a word to the wise - turnabout's fair play when it comes to kids/parents & don't forget to drop your own agenda sometimes & do whatever THE OTHER PERSON wants to do if you wanna be really close to them & not someday instead tearfully singing 'Cat's In The Cradle'!