If his role is as big and important as Ranbir & Alia, his name should appear first. If I remember correctly, in Bhool Bhulaiyaa 2, Tabu's name came before Kartik & Kiara. But if it's a supporting role, then nothing wrong in it.
I was actually quite impressed with BB 2 makers when I saw Tabu's name first then any other cast names and it was also well deserved bcoz she indeed was one of the lead in the movie.
As far as AB Sr. is concerned, he has a very fragile ego so it definitely hurt him that his name appeared after Ranbir and even Alia 😆 but tbh it seems like he does have a significant role and not some cameo so I guess in that aspect he deserved to be mentioned first. But at the same time, this is just a teaser so I can also forgive this mistake of the makers and rectify this during the movie credits.
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