DH is very close to his brother and nephew (16) and they often spend time together.
BILs birthday is coming up, the other day nephew messaged DH telling him he wants to buy him some tickets, but might need his help (buying them online). Nephew told DH he'll pay for his own ticket and BILs but DH could go if he wanted, and he is.
Anyway, today nephew messaged DH saying he doesn't think he has enough money for the tickets (they are expensive, even for just one person!) and has asked DH if he'd give him the money.
DH has already bought BIL a present and these tickets would just be from nephew, and not DH as well even if he put some money towards them.
AIBU to think he shouldn't do this? Just to add, our finances are joint, I wouldn't care if it was his own money.