I lost my dad many years ago but I have fond memories of him. He was a hard working man and didn't retire until he was 75! Although he wasn't an affectionate person, as a lot of men of his generation didn't seem to be, I knew he loved me and I feel sad when I hear or read of children who have never known a father's love or have been treated badly by them.
So I hope that you can give your dad a big hug today if he lives nearby or can ring him and thank him for being your dad.
Have a wonderful day!