Actually we can't compare relationships with one another. Each relationship holds a significance in your life. Everyone is special to you in your own way. We can't have a "MOST" special person. Parents, siblings, in-laws, close friends are all important people whose value of relationships cannot be compared with each other. They all play a different role in your life and these roles cannot be fulfilled by others. For example, the relationship you have with your mother is completely different from the relationship you have with another important person in your life (significant other, friend, siblings/cousins). Now you can't "choose" between the two about who is more important. I like to use the "saving" example. You and your two loved ones are in a dangerous situation and you can only save one. It's hard, you can't choose between two people who hold equal importance in your life. We don't usually rank people in our lives according to "importance". You need all of them in your life and you should care about each and every one of them.
So, Bihaan does not need to be the MOST important person in her life but he can be ONE of the important people in her life whom she cares about.
Sorry about the rant. I usually don't post much in the forum but this felt "post-worthy".