there is no shame in using it alone. Use it with others, depending on the specific situation. If you are having dinner with your parents, it's no problem at all. If you treat your parents' friends, there is no problem with movie tickets. If you eat, you can use vouchers at most, and other types of catering group purchases can never be used! Because you can't order freely, or other restrictions (waiters will loudly say "seafood drinks can't be discounted" and so on), it will make older people feel uncomfortable. No matter what the reason, we should make our guests comfortable first. In fact, I don't even need a voucher to treat people except my colleagues.