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! 
Of course I don't know how old was your dad at the time but I guess he would be at least 45-50 years old, and did you actually expect someone of that age to go online, study about bitcoin and understand how to use an exchange, send all the KYC documentation, move the funds around, etc etc? If you had no idea how to do it, and you probably grew up using internet, how were you expecting him to do that?