I searched on this and couldn't find anything, so forgive me if it's a repeated question...

I hope I can explain this right. I have two friends on Facebook that live together and have the same phone number in their profiles. Lets call them Fred & Ethel. When I get a text message from either one, it always shows it as coming from Fred. I have tried unlinking profiles and everything, but it doesn't let you do a lot to contact info that comes over from Facebook. Is there a way to delete the phone number from Fred, or at least make Ethel the main contact for that number since Fred rarely texts?