So why bring Sundari in now, who's only connection to Anika is Sahil if not for the lose end of Sahil's custody? If they are rebooting the whole track with Anika and Shivaay, that track does not start at the beautifully decorated mandaap he sets up with his own hands. That track starts with BOOM-- the original situation where Anika married Shivaay for Sahil, And now, Shivaay will marry Anika, for Sahil.
Sundari Bua also used the money to gamble and pay off her loans. Later, she wasn't in a position to challenge Anika when it came to Sahil. Remember, Anika threw her out, especially after she gave Anika over to the goons. Back then, Anika claimed to have spent the night with Shivaay to save him. Sundari came back when Daksh was stalking Anika. She was pretending to be good, because she had cost Anika all her money, and was in terror of being thrown out again.
Anika got money from Shakti/Dadi as a loan for Sahil's expensive boarding school to get him away from Sundari Bua. Post Daksh, Sahil got placed in a good school by Shivaay himself, out of guilt or whatever.
But Sundari Bua is Sahil's legal guardian, throughout all this. She says so, she stays in the house on that basis. It makes sense, she is his Bua and Anika was not even properly adopted by Sahil's parents and doesn't have Sahil's last name. Anika has tried in the past to get guardianship (lawyer's scene where she pays him, but due to Shivaay's manipulations the lawyer misses the court date).
But now, Ragini and Vikram dont need to do anything more than pay Sundari's legal fees to bring Sahil back and they will win over Anika and Shivaay, both. Shivaay cant use his money/power to stop it. And if Sundari Bua has money to fight Anika, and to claim she is a bad girl, who is sleeping with her ex husband and living with him at OM and all that, she can take Sahil back legally. Anika's relationship with Sahil is not as legally valid as Sundari's is, with Sahil.
This is what the outside world/law court will see: Anika is a characterless divorcee, notorious in the media. Remember her "affair" with Shivaay before marriage, and now her failed marriage with Vikram? First was a media wide scandal, now, I guarantee Vikky will give her a bad character certificate acche se. She is now single, with no background/family, living with her ex-husband (in sin), with no income or khandan to help her out.
Sundari can win this, if Shivaay does not fix this double quick. And the only way to fix is, is to marry her, so they can fight this. Welcome back. Sundari Bua! I for one want to see Shivika unite to close a loop, get the brother, and go back to powerful, SANE writing.
Ladies?