Abhi’s relation with his father is way different- he saw this guy hit his mother- so it makes perfect sense that even though Harsh changed after the divorce, Abhi never called him dad. But Abhi respected him and made sure to include him part of the family functions. Another thing, there was this one moment he called him Papa- it was when Manjiri was freaking in the hospital after Neil’s death Akshara’s call, and Akshara also was gone. Then Abhi was like I don’t know what to do Papa, Akshara is gone, Mom is in the hospital, Neil and my kids are dead, and he hugged Harsh then. If only Harsh properly guided him because then Abhi was really seeking for help on how to control the situation .