Can other family members see my text messages?
Text messages should be private, I hope my mother can NOT see them when I sigend her up for Apple Music
pages-OTHER, OS X Mountain Lion (10.8.3)
Family Sharing does not share messages, contacts, or other private info.
Only Purchased iTems and the Apple Music membership.
http://www.apple.com/icloud/family-sharing/
Family Sharing makes it easy for up to six people in your family to share each other’s iTunes, iBooks, and App Store purchases without sharing accounts.