Okay guyz...if u go back to 17th may India episode...u will get the answer.....i will recall the scene :
Bani is making tea for roshni in her room....and she keep on putting 2, 3 spoons of sugar...n then rosh tell her to control...because lot of sugar can cause diabetes....and tells bani "Bani tumhein to aur ziada sambhalna chahiye kyunke tumhare family mein to sab ko diabeties thi" bani is shocked n ask rosh how she knows n she says Jai told her....Then Bani goes to jai...n ask him wat he told rosh abt her family....Jai is irritated n goes to rosh n tells her that he already warned her to keep her mouth shut...bani is listening all this..
Okay answer is infront of all of us....Definetly Bani's mom or family is related to this accident....warna jai would have never told rosh abt bani n her family....so answer is in front of us...wat u guyz say???
Cheers
Sonia