Fiancé inviting far too many guests...

Hi! I’m a recently engaged and we are just now starting the planning process. I’m already experiencing quite a bit of stress though, due to the fact that my fiancé is expecting a MUCH bigger wedding that I. On top of that, his family expects my parents to pay, as he said it is “traditional”, but that his parents would chip in for the rehearsal and stuff. Now some back story on my parent’s situation: we experienced a family tragedy 2 years ago and my parents didn’t work for a year. They also had to uproot and move to a different city, while still keeping their home and bills in my hometown. Not to mention that my parents have never been good with money to begin. So as I anticipated, I called my mom today and she said they can’t afford to pay. She was in tears and even offered to give us their tax check next year to help. Now I feel bad for making my parents feel sad, AND my future father in law thinks he can have my father’s number to call and discuss money. I believe my fiancé and I could afford a smaller wedding of maybe 75 on our own, but he insists that he HAS to invite his whole extended family, which is very large. Cousins he hasn’t seen in years, old childhood neighbors and all of their children,
childhood friends. He is thinking 200 people; I only have 34 to invite. I’ve expressed my concerns, but he said everyone was invited to
both of his older siblings weddings, and they must come to ours. Most of these people, I’ve never even met! This isn’t how I wanted planning the happiest day of our lives to be, and it seems like I am the only one of us experiencing stress. Any advice on how to go about addressing this? With my FILs too? Is it any of their business how much my parents can or cannot attribute? Thanks, ladies.

- one stressed fiancé