Am I Being Unreasonable? Original Owner Wants Car Back

My car came from the estate of my cousin who died very young. He has 2 boys and the younger one was about 10 when his dad died.

When he his 16 he (and his miserable mother) have been telling me (and everyone else who will listen) that they want to buy it back.

The kid has ZERO mechanical ability. He has even less tools. The car had 4.56 gears when I bought it. It now has 4.88’s.

The engine had a small MP hydraulic cam in it when I bought it. It how has a .620 lift Racer Brown solid. I asked him if he could learn how to lash valves. He said “I don’t even know what that means but I can learn it”. Maybe so, but the margin for error is pretty small.

The engine was barely 9.5:1 when I bought it. Now it’s 11.77:1 and it has a tunnel ram. This is way out of his realm as a beginner.

The clutch will cost 2200 bucks to replace. It’s about 1k for a new disc and a rebuild. I’m not sure he can even drive a stick now.

This isn’t a beginners, learn on the fly car.

Plus, it’s not for sale. But it is a factory 340 car with a moon roof. So it has some value.