Detecting unauthorized access in Family Sharing
How will i get to know if someone has eye on my device
[Re-Titled by Moderator]
Original Title: Family sharing
iPhone 14 Pro Max, iOS 18
Question marked as
Nobody can see your device unless you give it to them and are signed in.
Some activities may be reported to your family organizer such as any purchases you make that are billed to their card. If a parent has set Screen Time restrictions or then they will obviously know about those restrictions, but not what you are doing inside of those.
Use Screen Time on your iPhone or iPad - Apple Support
You don't really provide us any context for being concerned about this so it is hard to help you without spending an hour speculating about all possibilities.