Well personally I think it's to bring Arjun into the household, since he was actually observing the Thakur-Phulwa and later on Phulwa-Sharbati interactions. Even I don't understand why they had to do it so early on, could've been handled after the operation.
Or maybe it was to show more of TP? Expecting some dhamaka to happen in the haveli later on, then only we'll understand what's happening.
And I'm wondering what Arjun thinks of his deal with Phulwa after entering the haveli...it's very obvious they're pretty darn well off, even buaji mentioned that he can just sell off 2 cars and easily pay the doc. So it would make him wonder why she's worried about the money when they're so rich.
That's just my hunch, the rest is all to see tomorrow I guess.