>>417374The moral thing to do is to sell it to him at a 15-25% discount from what you might to a stranger (whom you respect), if you're selling to a friend or family member. Anything less and it shows you care more about money than you do them. Anything more than like 40% and it says "you have no money so here'sa handout, poorbag".
If they're actually a poorbag though, try to determine the degree of their poorbaggery in exact terms and make it an expensive but affordable purchase for them. If you know somebody only has $200, for example, sell it to them for $60-70, that way they feel like "wow, that was a chunk of change, but nothing I can't manage". If they're bad with money, be like "Ah, just gimme what you got" that way you get a bit of cash and the person comes out of it liking you because you're "generous"
Also don't fuck your niece please