Have android, cannot receive group mms message from one specific iphone
I have a galaxy s4. My mom, dad, and sister, all have iphones. Whenever my family sends me a group message, I cannot receive any messages from my dad's phone. For example, if my mom sends a group message to my sister and me, I receive both of their messages. When she sends a group message to my dad and me, I only receive her messages, not my dad's.
Looking at the message history, group messages on my dad's iphone stay in imessage format (blue) even with my number as a recipient. On my mom's, the messages sent from her are green.
I can receive individual messages from my dad which are green.
I've checked the messaging settings on my dad's iphone and it completely matches my mom's messaging settings.
Is there any reason why his phone is staying in imessage format for group messages as compared to my mom's or my sisters?
iOS 7.0.4