How do I fix a problem group messaging with one non-iphone user and several iphone users?

My brother switched from an iphone to another smart phone several months ago. The rest of our family all have iphones. When he made the switch, my sister suddenly had problems with group messages going through for him--they went through as imessages for her instead of SMS or MMS. I didn't have that problem until a few days ago. I upgraded to an iphone 6 about a week ago, and group messaging my brother worked fine at first, and then a couple of days ago, suddenly stopped working. If I am texting him singly, it's fine. But in group texts, it automatically sets at imessage.
He has called apple and his number is completely deregistered with imessage. Does anyone know what else we can try? I have deleted all previous messages that were imessage and deleted and re-entered him as a contact.

I'm assuming neither of you heard back from anyone?  I'm having the same issue - just in the last few days.  The non-iphone user is not receiving texts from the group message because it is sending as an imessage.  It flipped to imessage randomly last week.  I've tried to delete the group message and restart it; same issue.  Would love to hear how to resolve, Apple!

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