That’s why you try and sell it here first. But yes, if that were the situation, I’d probably sell to the dad. Even if I made a little less.
Did you come to my house for something once? I can't remember if it was you.
In any event, someone came and i sold something, then ended up giving something else for free because it was a dad-son situation.
In general, you can say, "Well it's not worth selling local because they may be annoying later." But we, as humans, need human interaction. If you just see other human beings as transactional entities I am not sure you'll get much out of life in a lot of respects.
We live 1/2 mile from the municipal building/police station. I put in the FB ad that I will meet you in front of the police station. Nobody makes shitty offers. I have ended up giving stuff away cheaper, or even for free, once I meet them. But if they show up and lowball me, I drive 2 minutes home. No sweat.