Have name changed for this. DH's sibling is recently engaged and they have decided to get married in a v far away destination in 2019. We are already paying to attend a close friend's wedding abroad in 2018. The kitchen is on its last legs and my car needs replacing. Having priced up the wedding, it will cost us approx £3-4K for us to go (DH, me and kids). The place they are booking is one of those areas where all hotels are 4 and 5 star all inclusive places, so staying cheaply isn't really an option and flights are expensive. We've done the sums and could just about afford it but would have to sacrifice a lot over the next 12 months. We'd have to put a lot of plans on the back burner. Is it acceptable to decline a sibling's wedding invite on these grounds?