With the emptying of Shyam's dirty deeds bag, the truth about Arnav's reasons and circumstances for marrying Khushi will also be revealed. The Gupta's on learning this will be mighty upset and also be overcome with guilty for all the nasty accusations they threw at her and the way they treated her at the time of her wedding when all she was doing was yet again sacrifice for the family.
They will be angry with Arnav for backmailing Khushi into marrying him and may say stuff like she may be not our blood but we love her as our own and will not let her suffer. They may take Khushi back with them thinking they are just trying to release her from the shackles of an unwanted marriage which has caused her only pain. Of course noone really knows that they two have crazily fallen in love...
So now it will be Arnav's turn to win over the family and get Khushi back home... while still supporting his sister and helping her through her pain.
I also feel that though temporally Anjali will be against Shyam, feeling cheated, he will in time manipulate her by apologizing and aking for a second chance for the sake of their unborn child.