I also think Vinu is to blame for how Malti is. He pretty much lets her get away with murder. She says crap to him about his family and he just listens to it. Why should Malti respect Mamaji or Mamiji when Vinu himself is disrespecting them by letting Malti say whatever she wants. He got mad at his mom for forgetting that the milk was finished (Malti threw the milk out). I thought that was messed up. She's older now and things can slip her mind.. it can slip anyone's mind. He should've been more sensitive and instead of being mad, he should've told Malti that it's not a big deal. All these years his mother looked after the entire family and he discredited her in one day.
Vinu, in more ways than one, deserves this. The real victims are Ragini, Mamaji and Mamiji.