I have had a thought about a secret

My thought is that Dhawal is also an orphan but not only that, his actually Gopi's biological brother.

It fits right, after all isn't his personality like Gopi's? Doesn't Urmila hate it when Gopi wants to put Rakhi on him? Why he doesn't talk about his parents or other family?

Possibly both Gopi and Dhawal didn't know their parents as they died in the car accident and Urmila is hiding that secret from Gopi and Dhawal, remember they (Rashi and Urmila) don't allow Dhawal to come as they will bring Papaji. I'm thinking if this parents story is dug up further it will be known that Jithu doesn't want to the two of them feeling sad etc, so yes they grew up thinking they have each other as brother and sister, but didn't want them reminiscing too much of their dead parents or possibly them two deciding to split they small family, Gopi following Dhawal when he went to Mumbai for some time...what do you think?

They must have ran away because of the tension of their house, her fathers father must have controled the house which they must not like it, or their parents must have ran away to somewhere safe leaving a letter home saying about their death, and left fake bodies of theirs. to prove that they are actually dead

I don't think Dhawal and Urmila are related at all, if Gopi/Dhawal brother and sister.

If Gopi is related to Jithubhai through Jithu and Gopi's mother being brother and sister, then Urmila is not related to Gopi or Dhawal through blood.