I remember my dad always talking about bitcoin back in the day and how it was gonna be the next big thing. Unfortunately i guess he never actually purchased any lol he just talked about it alot. I was young still so i had no idea how to get any but i tried. I just remember signing up for crypto exchanges and being too young to buy damnit! 
If your dad's mindset was like that then, there is a good chance that you will persuade him to invest in bitcoin because you can see his interest in that matter. if at that time you already have the ability and deep knowledge when it comes to investment, you and your dad are definitely talking about bitcoin investment. it's just sad but it's not too late, you can still help him if he wants to or you'll be the one to continue doing things he didn't do before.