How do I stop having my sons pics appear on my phone and vice versa
How do I stop pictures I take from appearing on my sons phone and vice versa
iPhone 11, iOS 14
Are you using the same AppleID? If yes, don't; create a new ID for one of you. If you are using the same Apple ID the system has no way of distinguishing between you and thinks you are just one person.
Create an Apple ID - https://support.apple.com/HT204316
The other possibility is if you are using Family Sharing:
Family Sharing of Photos - "When Family Sharing is turned on, a shared album is set up automatically in the Photos app on all family members’ devices. Then everyone can add photos, videos, and comments to the album and be notified when something new is added."
http://www.apple.com/icloud/family-sharing/
To stop Family Sharing of Photos do the opposite of the above.