I'm having a huge problem with my FMIL over the wording of our invitations and could use some advice. As background, my parents are (very generously) paying for our reception. FI's parents are paying for the rehearsal dinner and offered to cover the cost of flowers (also very generous). When we were deciding on the invitations, we went with traditional/formal wording and considered my parents to be hosting the event, since they were covering the reception - which is by far the biggest cost. Since we went with tradition, FI's parents names were not on the invitation.
Well, my FMIL is literally flipping out over the invites and basically went off on my FI about how "this is not the way things are done". We were really confused because this is exactly how invitations are traditionally worded. Anyway, just to help ease the situation FI suggested that we include the "son of" wording a compromise. My parents and I were both fine with this, so we moved forward. Well, apparently FMIL is still unhappy with this and says that it's still not right.
Apparently her logic is that the invitation just mentions the church - and that my parents names shouldn't be the only ones on there as hosts, they both should. Since my parents are hosting the reception, their names (alone) should just appear on the reception card. FI tried to explain to her that this is not how things are done, but FMIL doesn't seem to understand and is causing a lot of tension, upset and overall angst in the family over this.
How should we handle the situation? How can we make her understand? Or are we the ones in the wrong?