Guest list drama with in-laws

I’m trying to nail down wedding tasks this weekend, but instead we are just spinning our wheels. We originally planned to invite 50 guests because we wanted an intimate wedding. However, FH keeps letting his friends and family invite themselves. I let him do it twice, but told him he needs to start being firm and telling people no. Well....now the list is over 80 people.
Last week FH’s mom emailed me and asked why no one from their family is on the current guest list. That is a lie. We invited his parents, his siblings (including their partners and kids), and the aunts and uncles FH wanted to invite. Suddenly, FH’s dad wanted to invite his two cousins. I told FH to tell his parents if they want to invite people they need to financially contribute and pay the $130 pp fee. He said he would. This morning, I am working on the list and he informs me his parents want to invite an unknown number of his dad’s relatives. I told FH no. Absolutely not. His parents aren’t paying a single dime towards the wedding and we are already over the 50 person limit. His dad has 8 sisters! The additional 10 people they want to invite would cost $1300–more than they can allegedly afford. (They allegedly can’t afford the $1800 rehearsal dinner, but we never pressed the issue).
FH and his brother decided it would be a good idea to remedy the situation by only inviting a few of FH’s close friends to the welcome reception and the after party—but not the wedding. I personally feel that it is very rude to invite someone to a destination wedding and not invite them to the wedding itself. Now FH is going to disinvite friends of his, who he originally wanted to go, to accommodate his parents’ and he is allegedly going to tell them they need to pay the pp fee. I am fine with it. It solves the problem and doesn’t affect my guests. But I told him it changes the demographics of the wedding to being significantly older and not reflective of who we are. I told him he needs to ask himself why he is bending over backwards to let his dad turn this into his personal social club and he is going to snub friends he actually wanted to attend. I have had to fend off similar suggestions from my own mom, but at least my mom is contributing the equivalent of a third of our budget. I also straight up shot her down. However, it’s not my family and I won’t tell him how to handle them. I also fear this isn’t the only demand FH is going to give into. I told FH no more additions, I don’t care if they pay for the guests or not because we never wanted a big wedding.
I just feel like venting and I am a little sad because the fun party I am envisioning is slowly turning into a retirement home social club due to FH’s parents undue influence.