I don't think a lot of Olympics gold medalists are taught by former Olympics gold medalists. Most teachers never go on to accomplish what their students achieve. I think OP has a fair chance of giving the nephew a great start - and whether that leads to Jobs level of accomplishments will depend on perseverance and luck.
I knew the guy who worked with Jobs and hated him with passion.
Let's keep the useful image parts.
“How many of you are from manufacturing companies?”
[Some hands go up.]
“Oh, excellent. Where are the rest of you from? Okay, so how many are from consulting?”
[A number of hands go up.]
“Oh, that’s bad. Yeah, the mind is too important to waste—you should do something.”
“I think that without owning something over an extended period of time—like a few years—where one has a chance to take responsibility for one’s recommendations, where one has to see those recommendations through all action stages, accumulate scar tissue for the mistakes, pick oneself up off the ground, and dust oneself off, one learns only a fraction of what one can.”