I wrote this reply to Priya, that Varun looked indifferent towards Ishaan. Ishaan is more of a channel or an armor for him. You wait and watch how Ram is going to replace Varun as a father figure.
Even though it's been said that Varun is a loving father, today I found it alarming; if one is good at upbringing, then he should be confident about it whereas Varun's ego was hurt when Sara questioned.
Like you said in the reply to me a repeat VK-Ram story in the form of ishaan-Ram does it mean Ram was actually adopted technically ishaan is Ram's nephew so quite possible that Ram is VK's nephew who was adopted by VK & given a Kapoor surname.