I think that since Arjun now knows the truth he will admit Suraj as his elder brother. At least in today's precap Arjun's eyes told that. If both of them becomes together then Mansen will be out of the house.
yes...it will be a gradual process, but it seems like it's heading in that direction. I can't wait 4the day when arjun and suraj hug....aaww...they both need brotherly love! 😆