A. Assume for a minute the biological dad is already married to maasi when the truth is revealed.
Abhi will file for sole/joint custody to claim Abhir. 
Aarohi will be filled with insecurity that Abhir is the full blooded grandson versus Roohi. But she will be the legally wedded wife so she might pretend to be willing to be a step mom to Abhir. 
Abhir will grow up in two households- one as a Birla and the other as a Sharma. 
This will be complicated but the rishtas all around will be honored.
Manjari will get the best deal - she gets to keep the newly whitewashed bahu beti she loves, she gets a relationship with her grandson, she is finally rid of Akshara for good. Roohi gets a step dad in Abhi. 
B. And now assume the biological dad breaks marriage to maasi when the truth is revealed.
Abhi will file for sole/joint custody to claim Abhir. 
Aarohi will be filled with insecurity that Abhir is the full blooded grandson versus Roohi. She will turn to OG Aarohi quietly plotting. Roohi will be disappointed with Poopy 💩. 
Abhir will grow up in two households- one as a Birla and the other as a Sharma. 
This will be complicated but the rishtas all around will be honored.
Manjari will get the best deal - she gets to keep the newly whitewashed bahu beti she loves, she gets a relationship with her new grandson, she is finally rid of Akshara for good.
Manju will continue to plot to get her son remarried to Aarohi. 
C. Somehow Abhira Reunite ( Nav is cliffed) - if they are endgame the makers will move heaven and earth to get us there. Then legacy baby girl pops out. Ak cliffed. Aarohi and Abhi co parent respective kids. 
Originally posted by: iheartChai
Will dynamics change once Abhir's truth is out? It has to. 
Arohi
She is all about Abhi putting Roohi as first priority. Will she really risk that by accepting Abhir and becoming a step mom?
Manjari 
Abhir is her full blooded grandson. Would she really forsake him because he is also Akshu's son?
Would she really agree in making her son, Abhi into a uncle to his own child?
4