I think theme is clear that Amber will be reason for separation.
I just caught up with all the episodes, when I saw the scene where Aditya states that he was scared to lose Ginni, I think Aditya may find out only partly about her father's involvement with whole Dhabba business thing. Here, Amber knows Aditya has deep feelings for Ginni and may bring up that attitude of 'Go tell Ginni, what's the maximum damage, she may leave the house and you forever and maybe ask for compensation from business but I know Daarji and I will always be happy to give her the part... But we all love Ginni alot to now let her go or else even Daarji knew... Ginni respects him alot too... All this will break her completely... " something on those lines to guilt trip. So Aditya may get her the diary, and tell her it was found at Gurudwara or somewhere without revealing the truth. He may feel it will hurt her knowing how his family broke her trust and most importantly he may not want to lose her!
When Ginni finds out, she may feel betrayed as everyone in the family sort of hid this from her and decide to leave Aditya anyway because of his decision to fall for Amber's speech 🤪
Then Adi will begin his mission to convince Ginni and bring her back. convince her, bicker with her... Mostly Gulabo may turn against Adi too, but Goldienor kids may work together to reunite....
The end of my imagination... 😆