For DH's cousin, even though we are not invited to the wedding?
It's not a particularly small wedding, and pretty much all the rest of DH's family including his mother, brother and his family have been invited. DH isn't particularly close to his cousin, but we do see her and her family maybe twice a year when we visit the rest of his extended family.
I've never been in the position where I've not been invited to a family wedding before, so not sure what the norm is. We've bought a card, but we're not sure whether we should be sticking some vouchers in it or not.