How was it traveling with your significant others family?

My partner and I take cruises at least once a year. My MIL has traveled with us and it’s been awesome. This year we are taking my son + MIL + SIL and their spouses on a cruise. What was your experiences with this? Did you have fun what were the biggest annoyances? Anything you absolutely have to do or avoid ? Thanks in advance!

P.s not trying to find things to hate just will be my first time traveling with them period / a group of this size in like 23 years.