Looks like you two deserve each other
A few observations that may or may not be relevant to you...
I was a couple of years older when I started with something similar to that kit. It came with practical "build it" instructions and some theoretical "how it works" instructions. I didn't understand most of the theory, and found that a little frustrating. Nonetheless, the simpler circuits were invaluable. To start with, good = simple and quick, and good = copy and extend.
A major difference between "then" and "now" how to learn. "Then" information was scarce, you probably had to wait weeks for the library to get the book, and the book might or might not be helpful. You learned to scour any information source to glean as much understanding as possible. "Now" is the polar opposite: there is so much information that a prime skill is speedily determining which 90% to
ignore.
I also built other, simple, things from scrap. One example, inspired by seeing Tim Berners-Lee doing it, was to build a "burglar alarm". It was only a battery, a bulb, a buzzer and some wire running around the skirting board to a couple of doors. When the door opened some wire/metal contacts touched each other and the buzzer sounded or the bulb turned on. I learned a lot about voltage, current, circuits, and reliability engineering
Later on I added a CdS light-dependent resistor and electro-mechanical relay; nowadays you could use a photodiode/photo transistor and LED.
I also had a space where I could leave a train set erected. That was good for planning and implementing many simple circuits using only what was to hand or which I could afford with pocket money. I became well-recognised at the local hardware and wood offcuts store!
Things such as the Lego Next robots would have occupied the size of a house; if they had existed then I would have been in seventh heaven.
Visibly
learning something difficult together will be an
extremely valuable example for him to follow. That was true for my daughter when we both started to learn to fly gliders when she was 15 - she found she could do things she never imagined were possible, and that she could be an accepted and valuable member of the club community/team (i.e. not a parent-daughter nor a teacher-pupil relationship). I repeatedly made sure she knew that she didn't
have to continue, which in retrospect was a wise decision since it helped her feel she was in control. But she did continue, and it meant we enjoyed each other's company until she left for university.
Whatever you end up doing, have fun, safely.
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