Here's my oldest step daughter running a RC crawler course. step son is tall kid to the right. She's only been for a ride once on my bike for a short time, but that was quite the accomplishment. She just turned 16 and doesn't share the joy of the outdoors that I do but she likes to go along every now and then.
And while they've only been around for around a year and a half, I do think of them as my own. The 14 year old girl already wants a bike, of course I am thinking she figures that's a quicker way for her to drive. A catch-22 there.
3 ready made teenagers are quite the handful, especially for a hermit like me, but I wouldn't trade the experience for anything.