I nominate my Dad based on a recent conversation we had.
Dad: Oh by the way you know cousin Mike is getting married next year
Me: Yes I heard, but I also heard we're not invited
Me: Yes I may be wrong but <Mike's sister> told <my sister> that they're just doing something small so not including all of the cousins etc
Dad: Oh that's a shame. I wonder if it's about money? I should call them and offer to pay for all of our plates.
Me: I'm not sure if that's a good idea, they've probably already picked their venue so it might have a limit on headcount.
In his defense, he is a little bit wealthier than his relatives so does pay for things from time to time, for example taking Mike's parents (his sister and her husband) on vacation with him etc, which they appreciate, so from his perspective if it's a simple matter of finance then he should be able to fix it. But given Mike and his fiance have probably agreed on who they want to attend their wedding - most like in consultation with Mike's fiance's family who she is very close to - I don't think calling and insisting that they should invite our whole family is reasonable, particularly given we don't know the actual situation e.g. who is going to be invited and the size of the wedding. Did I mention that I have several siblings, plus our spouses and children, so inviting us isn't just an extra couple, we're talking about an extra 15 people!