We know Sagar's brain doesnot work logically but still lets figure out what info he has and what could be his possible action..
1. He confided to Buaji he likes spending time with Vidya who he considers to be a good friend. She is not the wife he expected in real life as she is unpor.
well, he will soon realize that is not the case anymore. The laptop, a happy birthday song, God forbid a signature on the divorcee papers would prove Vidya can read and write...
2. Sin tells him that Vidya might have a secret lover and she goes out everyday to meet him...This just made our cute dimwit so jealous, he chose to wear Di's selection (and looked quite uncomfortable, to be honest) and shows an attitude towards Vidya..
Well, Vidya's signature again can prove that she went out to take lessons. Maybe some pictures from Balbant may come in handy if they reach Sagar's hand first. Buaji might ask everyone to raise their glass to Sagar's health and Vidya being the wifee gets to make a speech, where she speaks in English and stuns the Singh Khandaan...
3. Bharat was making a birthday card for mamu. He might ask Aniket to write something. And we know Aniket can write as he wrote Sin's name in Bharat's drawing book..he might write something about Vidya's innocence...
4. Sin also told him that a bohu brings the family together and Vidya is doing the opposite. Well if sagar realizes that Sin is not the only family member..he has his mom, bua, jiju, cousin, nephew, and his adopted son (all of them are crazy about Vidya and they always defend her!!) and they feel the opposite of Sin.
Given these info, I am sure Sagar won't let us down. He might get drunk, scream at Vidya infront of the Khandaan...There will be confrontation, anger, and a lot of tears..but love will prevail...Otherwise I am really going to sue the writers and directors...
If next week is anything like this week, I am leaving BMTD...can't take anymore of Sin's smriks...