Ever since we got engaged in 2013, my husband and I have had issues with his parents. Growing up, there were signs, but DH didn't realize it wasn't normal until we got together.
To sum it up:
They are narcissists. Everything revolves around them.
Everytime we come back to our original home state, it's a battle. We give both sets of parents our "itinerary" (e.g. we will be with this side these days and this side the other days). We've done that to avoid issues of where we spend our time so everyone knows ahead of time. Everytime we've done this, it's been drama with his parents. The first time was because we were flying in for 4 days, 2 with his parents and 2 with mine. They wanted us to get off the plane, drive 4 hours to see his grandma and then drive back. We said "not this time. it's a very short trip and we're already traveling 1500 miles. We had seen her a previous trip too.
*con't in comments*