both my boys go to the field with me when they feel like it, there 4 and 8 and they love it my youngest calls my P-40 warhawk the sharkmouth plane.
there are many times when I ask them if they want to come with me when they decline the invite they want to play with something else or just don't want to go I never push it, other times when I want to go by myself I can't get rid of em!
they love the shop also helping me with my kits.
the key like previously stated if you keep the door open they will come in if they want to join you, nothing better than sharing a hobby with your kids.