Def think they are gonna be bro and sis in show
Sunny had traumatic childhood according to keerti.. he doesnt beleive in marriage
Pallavi had a traumatic childhood and we know nothing about her past othrr than orphan status
Pallavi said she opened her eyes in bros arms.
And sunny had a poor marriage to look at ..
So sunny would be "older" then pallu if he remembers marriage because pallu may not have been born yet.
Or sunny is hald sibling or something. Idk but def they are related im convinced. There scene today was also unnecesssry. She didnt have to be alone with him to investigate and send farhad away. I think writers are angling some relationship there.