How do I prevent Shared Photo stream I have recently bought an iPhone 6s and transferred my 5c to another family member. I have updated both photo libraries of both phones to my Macbook Air. My problem is that all photos appear on each device at any time, and if I delete a photo from any device then it is deleted from them all, (with or without a cable connection). I would like to use the Macbook as a library for both phones, but keep different photos on each phone.
How do I do this without losing any photos now?
You need to set up separate Apple Ids for each user, possibly using Family Sharing to share purchases and other things.

A simple iCloud id, which is what you have, assumes you want everything syncronised between all your devices.