When is it too much

Does anyone have issues with mil constantly pressuring or guilt tripping to visit? It’s like a ticking time bomb when we’re asked to come visit. We just saw them at the beginning of June and now they asking us to make a trip out there in two weeks. I’m not a fan of making trips every month to go see them. And since I’m not wanting to go out there his dad booked flights just for him to go out and visit and then added our ten month old to the flight reservations. I’m just taken back and feel like I have no say. They need to take a step back out of our relationship and not make it such a pressure let alone booking my fiancé and baby flights. (And not including me) It’s not their place and idk how to change it. I feel disrespected and they are overstepping boundaries. Idk how to paint the picture for my fiancé. His parents don’t need to be controlling our schedules