Sorry about your Dad. It's way too complicated loosing a parent, and it's never easy, no matter how old they are. I didn't have a Dad in my life but I had a wonderful Mom and Mother-in-law and I miss them both all the time. I am still learning things from them today. They just sneak in my life and remind me of something I missed when they were here.
We are all praying for that daughter. I know it must be crushing your heart.