I started watching KDMHMD just recently and I found that the introduction part was losely linked to BMTD.
Vidya and her mom were harrased in her chachi's place. Similarly Heer and her sister are harrased in their chachi's place.
Vidya's chachi also had a daughter who was stupid. Heer's chachi also has a daughter who is stupid and cannot think for herself.
Vidya's cousin was a food freak while heer's cousin is a diet freak.
Vidya's chachi also wanted her daughter to get married to Sharad. Similarly Heer's chachi wants her daughter to get married to Prem to lead a rich life.
They also had a similar dialogue that "Baghwan jodiyan banathey hai". Not sure about that.
So I have a feeling that the really villain is not Chachi but might be the Nanads who are yet to be introduced.
Please post your opinion.