My wife and I both now have IPhone 6s Pluses. I also have an IPhone 6 issued by my work. We've had iphones before (3s & 4) at the same time, but now, whenever my wife texts me, it shows up on both my work and personal phone, and I can also see her text message feed, which means I will probably see any text message going to her. They are all tied to the same itunes account, along with our IPad Air 2. Is there a way to fix this while remaining on the same account so I don't see all her texts and vice versa?