Mexican holiday reminds me of some relatives.
My parents owned a condominium in Hawaii. They had agreed to let my father's sister and her family stay there once. Family made keys, and used it as a base for years without asking.
The condominium was in a compound where there are a lot of rentals, so my parents assumed the rental office was leasing it out without permission. Parents were 4,000 miles away, so couldn't prove anything. They only guessed about the leasing thanks to outrageous utility bills. This went on for, probably, 15 years.
My cousin bought a condominium in Palm Springs, and said my parents could use it and his car there, any time they wished, as he always felt badly about their family use of the Hawaii condominium. Of course, by this time, my parents were pushing 80, so there will be no use by them.
When my sister married, aunt, uncle, and cousins came to the wedding. My parents' home was filled with other guests, so they had to stay at a hotel. Cheapa@@ uncle presented the hotel bill to my father to pay. My father was beyond arguing, and just paid it.
Cheapa@@ uncle (father's sister predeceased him by several years) died recently, leaving an estate worth about $20 million. My parents are comfortable, but nowhere near that amount. Their biggest asset is their house.