NC for this.
Planning our wedding and told by his family that the bride's family pays, traditionally in England.
So they'd be fully expecting to pay for his sister's, but not ours, although they will give us some money.
AIBU to be bothered by the unfairness?
Just to be clear we didn't ask them to pay for anything. They brought this up. Just a bit shocked as they're otherwise very generous (pay for meals out etc), and it's 2022!