Yep that's right...They all live in the same house...
I don't know if anyone remembers, but around the time of Sapna's wedding I posted a thread that Sapna and Guptas live in the same house... with proof... but since the I-F search isn't working I can't post the link here because I can't find it...
But you know where Shubh is pretending that he's fainted and Keerti comes to see him... well... at the back you see orange steps type of thing in the back with the ornaments... that orange thing is in Sapna's house, as well as Gupta's house as well as Shuby's house...
I'll try to find some pics for proof.
Sorry if posted before.
Love,
Sonia