Dear MRSC08,
Welcome to this forum. I hope your dad uses it. He will find it filled with very caring and understanding people. As his recovery progresses, he might have some questions that people on this site might be able to answer, or advise him where to get those answers.
I was operated on 20 months ago. No two recoveries are the same. Your dad is going to need a lot of understanding from his love ones and from friends. I hope your dad has a speedy and successful recovery, but for many of us here, we still suffer from many issues, be it balance, hearing, fatigue and comprehension. For many of us, we look fine, but no one understands how we are suffering internally. I hope that is not the case for your dad, but if it is, please have enormous patience and understanding. Brain surgery is very challenging. And finally, when you are driving him somewhere - take it easy on the pedals. His balance system needs to recover, a heavy foot is brutal on a recovering AN patient.
Keep us posted.