Question about Romi

So we just found out that Romi, Tia, and Svetlana (don't know if I spelled it right) are sisters. But remember that one episode Saumya introduced Romi to Rudra as her childhood friend. Are they ever going to clarify that? I hope they do. I think they must of moved after their father's acident. How does Shivaay not know about this shouldn't he know about the Oberoi Industry past or does he know but doesn't think that Tia would something like that. And another question about Tej whenever he supports Shivaay like about they baby and everything related to Tia is he only supporting him so the merger doesn't happen?