My son has never had any interest. My youngest daughter (the Architect) seems interested in mechanical things.
I have some grandsons who seem interested in cars and such. I hope to be able long enough to autocross with some of the grankids. The oldest now is 10. She is going on 17 though.
Yikes!
I hope she has better judgement than her grandmother did.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.