Remember when Karan was going to get Abha, Jagmohan said if you do this, then you are not my son. You do not have my name, and other little lovely statements of affection. These words are the first things Jagmohan remembered when he saw Karan in ICU and he realized how wicked his (potentially last) words to his son were.
Tomorrow, Thakur will essentially do the same to Abha. And when she chooses Karan, it is something Jagmohan will notice. That both Karan and Abha will sacrifice the same for each other. I think that while J will be happy that Thakur's beti is HIS bahu (to humiliate Thakur), it will register in this mind how much Abha loves Karan.
What say you, friends?