People definitely get weird over weddings. When DD got married, the agreement was that we'd each pay 1/3rd (DH&I, groom's parents, and Happy Couple). We had hoped to set a budget, include everything except the rings and honeymoon, and have everyone pay their 1/3rd up front, and then let DD/fiancee manage everything. Unfortunately, the groom's parents weren't having it, they'd pay up to X dollars after the wedding but wanted to see what they got for their money first. You can guess where this is going. DH and I ended up paying for almost all of it, with DD paying her 1/6th share.
The groom's parents paid for the groom's father's and brother's suits for the wedding (bro was best man, dad wanted to match). They also paid for the rehearsal lunch, but it was weird. They picked the location, consulted with DD and her fiancee on the menu and agreed to it, then changed everything. DD/fiancee wanted a brunch (scrambled eggs, pancakes, breakfast meats/breads, fruit, etc), and made it clear that there were dietary considerations (a few vegetarians, one bridesmaid with celiac/milk protein allergy, DD is lactose intolerant). Menu ended up being what the parents wanted: Sliced sirloin, chicken, mashed potatoes (which were all on the wedding menu), no non-meat entrees, everything with either dairy or flour (cheese, cheese sauce, gravy, croutons, etc.). There was literally nothing that one bridesmaid could eat, which was embarrassing. (DH ordered and paid for a meal for this lovely young lady, who was willing to go without.) Of course is was a cash bar, individual tabs. We were told no significant others for the wedding party and no other relatives. My sister was there as her 2 high-school aged daughters were in the wedding party, but I'd hoped to include my other sister and BIL who'd flown up from NOLA. They don't have disposable income and hadn't been home in 10 years- but whatever, we did as we were asked. I am not an "everyone from out of town and all relatives should be at the rehearsal lunch" person, I feel it's for the wedding party and immediate family, but to exclude spouses/SO of the wedding party felt odd, as did not including my Sis/BIL. It was so surprising to get to the lunch and discover that the groom's "immediate" family included his grandparents, SOs of the groomsmen, some aunts/uncles. There were probably 50 people there, only 10 from "our side" and that included DD and the bridesmaids (including the girl for whose lunch DH paid). I know what this place cost, it was about $15 per person, so I don't think that they thought this was "their share" of the wedding cost. Oh well... that should have been what we now know was the final warning as to how the marriage was going to go, too.
(Not my proudest decision, BUT... We left the lunch in a hurry as the bridesmaids had a nail appointment and time slipped by. We were in the middle of having our nails done when I realized we hadn't paid our bar tab... less than $20 for 3 mixed drinks. Oh well. I'd listened to DD sob all the way to the appointment, lost and hurt as to what the lunch turned out to be and "why did they do that". I figure the groom's parents owed me- and her- for all that sadness. )