Not receiving texts from 1 person on an iPhone 4s?

I have an iPhone 4s and my dad has an iPhone 5c and I receive texts form everyone except for him. I'm signed in on my iPad and receive the texts their but not on my phone. I can still make calls on my iPhone to him.

Does your iCloud account for iMessage have your phone number listed and not just your email account? That's probably it. Verify it does. If it does, reset that. If it doesn't, add it. Best luck.
http://support.apple.com/.../kb/ht5538

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