If I had kids, I would probably subscribe to KiwiCo ( https://www.kiwico.com/us/store/cp/12-plus-years-old ). Lego? Unfortunately, my limited (geographically-constrained) contact with my nieces and nephews has severely impacted my ability to influence them towards technology. :( Exposure is one thing that is helpful, but in the end, you have to find something that your son is so enthralled with that he wants to pursu…
I feel like having them complete simple breadboarding / soldering projects where they are actually seeing how things work at a pretty low level and developing a physical skill was more valuable - or get them going on simple Rasp Pi projects if they have an interest in programming.