I don't think Abhi is the worst son, but his short temper and attitude towards his father is unacceptable, irrespective of their behaviour all parents deserve respect from their children.
As Manjiri rightly pointed, abhi should be mindful of the fact that he is thinking of getting his beloved wife into his house and if he pick fights with people, akshu can have hard time getting along with them.
Also he has promised a huge family wala shaadi ka photo for akshu and it will be incomplete without his dad in it.
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