If you use the iCloud Photo Library every user must be logged into the same Apple ID account cand with that everyone gets the same emails, messages, contacts, calendar, etc. Not sure that's what you want.
There's Family Sharing: Family Sharing - Apple Support. The following is from that document: Now
The whole family can contribute to the family photo album.
Now collecting and sharing family memories is easier and more fun. 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. You can add or view photos and videos from iPhoto on your Mac, and from Photos on your iPhone, iPad, or iPod touch with iOS 7 or later.
If you decide on going the Family Sharing route this Apple document should be of help: Set up Family Sharing - Apple Support