Although both of my sons have done some bicycling while growing up, it has mainly taken the form of casually cruising around the streets on mountain bikes. However, my elder son has started doing nighttime mountain bike tours of the "woods" on the UCSD campus with one club, and he has now taken two Saturday morning road rides with the San Diego Bicycle Club on the Peugeot PKN-10 road bike I recently gave him to try out, since it has always been 2+cm too tall for me. He has even invited me to join him on the SDBC rides, which I'll definitely try when I am not teaching my all day Saturday class at UCSD Extension. (It's always fun to show up on a bike that is older than many of the riders.)
Now I just have to work on son #2, who at 18 is far more interested in cars, specifically Audis, than in bicycles.