OKay...............
Pooja and pooja's sister have the same blood
pooja's sisters daughter is Nandani
So Pooja and Nandani have the same blood
Himit is Pooja's husband so he has the same blood as Pooja's and Pooja has the same blood as her sister and Nandani has the same blood as Pooja's sister (her mom)
Himit is Mihir's cousin brother so in a way nandani and Himit have the same blood and Himit and Mihir have the same blood so that means Mihir has the same blood as Nandani (in a way)
And last of all Karan has the same blood as Mihir and Mihir has the same blood as Nandani.................
So from the blood relashionship Karan and Nandani were already realated before they got married!!!!!!!!!!!!!!!!!