Lot of people on this forum are calling Ruhi arrogant for thinking she can take over Raman's chair. I agree, she should be more balanced and humble even as she continues to be ambitious. But what is Adi doing- harassing his own sister by not letting her work on her desk, mocking and insulting her when she's only trying to do her work. If he can't do anything constructive atleast not create trouble.
His idea to marry of his teenage sister was shocking. Firstly when the parents are alive there is no need for the sibling to take such decisions. I think Ruhi was justified in thinking that Adi is trying to get rid of her. Atleast she should have been informed. He even hit her.
Just because a sibling is older it does not give them the right to dominate/hit.