Since this morning, my iPad 2 and iPhone 6 have both been creating a second thread, whenever I get an iMessage from my wife's iPhone 5?! On my wife's phone, she has her phone number and her iCloud email address under the 'Send & Receive' section for iMessages and I also have my number + iCloud email address in the 'Send & Receive' section on my iPhone, however, when her phone sends an iMessage, it is totally random whether the message goes into her existing thread on my phone (the one where it shows the message is coming from her mobile number) or if my phone and iPad creates a new thread (which shows the message coming from her email address). I can't figure out what is causing this? If she sends a message to my son's iPod, it always shows that the message has come from her mobile number but when she messages me, sometimes it gets added to the 'mobile number' thread and other times it gets added to the 'email address' thread?! Any ideas?!