You kid is getting a license to print money. Any decent plumber/electrician should be knocking down $150k if they are willing to run their own show.The LTR seems viable if the market cools a bit.
With the oldest son attending trade school (probably electrician, maybe aero mechanic) there's a decent chance that we'll go into business together, he will be on call to fix #### while I manage the money. While that has a possibility of disaster, I'm not worried about it with him. But it's a few years before we'll take that leap.