If you're invited to a joint birthday party for two children but the whole class is invited, is it usual to buy a gift for both children even if you / your child only knows one of them? For us our DC is clearly invited by one of the children and the invitation only refers to that child but there may be children who know both.
I'm guessing everyone buys a gift for both children? I'd usually spend up to £15 on a school party gift but I'd be looking to spend £20 for both if it's a joint party. Is this acceptable?