I'm quite used to this situation.
As a kid I fixed all the bikes, mini-bikes, go-karts and eventually motorcycles in the neighborhood for my friends. My father was a journey welder & machinist, so I was taught well on turning wrenches. Even did some frame repairs (brazing) and some custom fabrication (like the trail-a-bike, but permanently welded together).
When my now adult children were young I fixed their bikes and several from the neighborhood, while trying to bestow basic skills onto the kids. Now its my garage where my sons come to use tools and a lot of my help. My wife can change a tire and do adjustments as well.