I actually respectfully disagree.... If a couple has a tight budget that only allows a limited number of guests, then I think you can't invite 1/2 of relationship unit and pretend the other half doesn't exist. Especially on a DW! I think if that was the issue they would have been more proper to simply review their guest list and determine how many couples they could truly afford to have there. If the OPs FI was important enough to have "made the cut to be invited and budget WAS the issue, etiquette dictates that they make room for his FI as well.
Agree 100%. I would trim the guest list itself not the other half. Especially with a destination wedding. I think at home may be different but only for singles. Someone with a spouse or fiancé or long term partner should be both as not to insult.
Just my opinion.
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