Who killed vrinda’s kids?

Ok a lot of speculation as to who killed her kids in a car accident. Many of you say its one of the kids in the family. I highly doubt that. However, My finger is starting to point towards nisha's husband. I think that that would be a character that would take a negative role as such. So right now the guesses are:

Sameer: highly doubt, since he is already in a lot of trouble..lolz they cant focus everything around him

Mahesh: he is the goody goody boy, so i dont think that his grandfather would ever reveal such a thing

Rohit: rohit's stuck in drama's so dont think he did anything either.

Maya's Son: we have never seen him so it could be a possiblity and the fact we still dont know what ever happened to him is a big question.

Maya's ex Lover: hey, you never know!

Janki's Brother-In-Law: He was the evil character from the beginning also so it could be that he did that. He may have something to gain from it financially, for instance, the business, which he did get. If you think about it, janki only had her sister no sons, it could have been an option for her father to give the business over the virunda's son, giving him a motive so he can get hitched with janki's sister and get the business in his hands.

I think thats all the options we have. Let's see where we go from here. My money is on nisha's husband. Somehow the case against manjeet and virunda's kids murder have to be linked together and thats the best way to do it.