Where I'm from, we call our fathers "Daddy."
It's not unusual to see 60-year-old cowboys, complete with the hat, the cattle and the big belt buckle, addressing their 80-year-old fathers as "Daddy." It's just the way we talk.
My Daddy was what pundits condescendingly refer to as "blue collar" or "working class." What that means is that he was a highly skilled person who could pull an engine out of a car, take it apart, rebuild it like new, put it back in the car, test drive the car to see if all was right and still be home in time for eight hours sleep before he had to get up for work the next day.