Mystery changes in shared apple calendar events.

Hey there Spawnreaper,

There are several variables to consider, but thanks for confirming that you nor your parents have created/deleted any events in your multiple shared calendars, even by accident. This is a very important detail.

Moving forward, it is unexpected for events to suddenly delete/create on their own with your multiple shared calendars that you have with your parents.

While this sort of unexpected behavior may need to be troubleshot with Apple Support, we'd like to help rule out a few things:

1. When did this first start, and has a restart been tried of all three of your devices? Here are the links that show how to Restart your iPad and Restart your iPhone. For a Mac, check out the section 'Restart' here: Log out, sleep, wake, restart, or shut down your Mac
2. The latest versions are macOS 12.4, iOS 15.5, and iPadOS 15.5 for compatible models. Are these the versions currently installed across all of your devices? If not, it would be a good idea to make sure you have the latest official(non-beta) releases for each device is installed. This link will show how to first back up, then Update macOS on Mac. Here's a link that'll show how to first back up, then Update your iPhone, iPad, or iPod touch.
3. Besides you three, are there any other family members sharing those same calendars, and have you already spoke with them about this?

Cheers!