Troy -
I'm sorry for your loss. I lost my father when I was 16. You'll miss him every day - no way to suger coat it - but it does get easier as time goes on.
I am the oldest of 4 kids. After my Dad's death we divided up his collection three ways, between myself and my two younger brothers. My younger sister - the youngest - was only 7 at the time. I held onto all three parts as it was the safest thing to do. Thinking back at it, we were pretty sexist in excluding my sister - even if she didn't care.
I shared my Dad's love of firearms, and bought out my brothers's shares over the next 15 years, as they didn't care about them (well, brother 2 didn't care about anything but modern stuff, then married a woman who wouldn't allow them in the house!

; brother 3 just wanted the money). 3 months after I had the collection all back together I gave one to my little sister, now an adult, for protection. It was the right thing to do.
Long story, but I guess I'm saying that if you have your father's guns, I'd keep them no matter what. Learn about them and shoot them - honoring your father, after all, he thought enough about them to aquire them. Pass them on to your kids when the time comes - continue to line and get another generation involved in our precious liberties!
Good luck!