Are they being petty?

Back story: My daughter meets a speech therapist once a week at her grandparents house. She goes to grandparents for speech because we had a large dog at home who would be a distraction. The dog died but we continued speech at the grandparents house because if we switched locations then we would lose the current therapist we built a relationship with.

Additional back story: I own a parking lot and an couple apartments. The grandparents also own an apartment. They asked if their renter can park in our parking lot. We allowed the renter to park there.

Current story: A new tenant moved into my apartment and owns two vehicles. We no longer have extra room in the parking lot. I informed the grandparents that unfortunately their renter cannot park in the lot anymore. (There are other places to park, on street, other parking lots, but no guaranteed spots)

The grandfather says “You promised me a spot so now your daughter can’t have speech at our house anymore.”

Then I exchanged these texts with my mom:

I understand this is an inconvenience and they have a right to be disappointed but I believe they are being super petty. I’m upset because they are hindering my child’s development over a parking spot. I’m also upset they basically uninvited us to Christmas at their house over a parking spot.

Vote below to see results!