You're getting the short end of the stick. Never understood why festivities should merge. Friend of mine his birthday is on Christmas. So apparently many (his parents) assumed that his Christmas presents also count for his birthday presents. This is a skewed up logic; instead of two celebrations he gets one celebration where you play a background role like the donkey in the Christmas play.
How you describe it; you only have two people and her dad has all the rest. FFS there are even people there who you don't like. You don't have to please everybody. Also you can hardly go wild if her father is there.
her dad is sound to be honest, been out with him once before years ago and we had a good time.
But yeah, apparantly i had to invite him, and we had to do it saturday as it was the only time he and her brothers could do it. Which is not really an issue for me as such, wasn't all pumped up for a stag either way. But its a bit sad that i can't get more than 1 person to come out who isn't previously engaged or even responding.
It will be the worlds worst stag do by the looks of it haha