My dad has an iPhone 4. He has his iMessage and group messaging turned on, but when I use iMessage to message him and my mom (who also has an iPhone, as do I), the messages that I send only go through to my mom (i.e. I send a group message to my mom and dad and only my mom gets it). When my mom responds, both my dad and I get the message, so that works normally. I can message my dad directly (not in a group text), but that sends as an SMS (it shows up green vs. blue), even though I have his number stored as an iPhone in my contacts. How can I get it so that I can iMessage him vs send him an SMS? I think once that part of it is fixed I might be able to send him group texts with success.