Keep your son safe! I let my kid help me when I was younger (handing me whatever I needed, and letting him choose the tools from my cart) but I never let him under my lift...
Yes, of course! Thankfully I can get under my truck without lifting it. My wife's Camry, however, will have to go up on jacks. He won't be allowed under there for that.

you owe me a key board! Lol