Jenni,
Sounds like your dad is making his own mental and emotional transition in your favor. I know it happens even though dad's are hard asses. I'm a 70 year old "dad" my male kids were a total nightmare, they thought it was me, I knew it was them. It took some time for me to lighten up and realize that no, I will not be able to mold them in my image because they are their own unique individual persons. Yeah, dad's sometimes have stone-like hearts, but blood doesn't run through stones and stones don't beat, eventually they soften up.