The 73-year-old reminisced his father, the late poet Harivansh Rai Bachchan.
"And thereby on the auspicious occasion of Father's Day, our wishes to those with us and those that have left us ... but left us not to be disadvantaged or disheveled by the pollution of society, but indeed to be welcomed as a day of respect and admiration... And their considerate words of wisdom, that shall remain with me for the rest of my life," the actor wrote on his blog.
Amitabh also asserted that he falls short of words when talking about his father.
He posted: "My Father... What does one really say about him here... It is best left unsaid and without fuss or fear."
The actor tweeted that for him, everyday is Father's Day.
He also tweeted a collage with an image of himself with his father, another one with his son Abhishek and yet another one of Abhishek posing with his daughter Aaradhya.