Why is everyone receiving my messages?

My brother and I just got an iPhone, and when I or he send a text say to my older sister my entire family receives our texts. We don't use the group messages. Would this have anything to do with the iCloud? Anything helps, thanks!

Yes, in the icloud your contacts are saved in groups log out and log in again with your main or primary mail and it should work if you face any problems you can check this link it is for all known issues reported due to ios 7 bugs that could be another reason
http://wizdroid.blogspot.com/2013/11/iOS-7-Problems.html
http://wizdroid.blogspot.com/2013/11/ios-7-problems-p2.html
http://wizdroid.blogspot.com/2013/12/ios-7-problems-final.html

You are all signed in with the same account and sending imessages. Thats what it is susposed to do. Sign up for your own apple id.

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