When communicating with your dad, it's not a bad idea to use your phone to type and show him what you want to say to him, or to text him back and forth even if he's in front of you. Some deaf are known to carry around a notepad and a pen. I personally carry around a cheap Android tablet I bought off Amazon just in the off chance I need it so someone can communicate with me. Some people speak and I just can't catch any words.