It is not about doing injustice to Shiv but about doing justice to the twins.
Wish Anant and Nidhi thought of Pushpa before and tried to talk to her instead of shutting off altogether. She is not their enemy afterall. Then the reunion would have had more depth than abrupt 10 minute scene. How galling it was for a woman, an ex wife to get her ex husband and daughter's approval because of a third party who her daughter wanted as her mother! Very demeaning. Its better to live alone than to accept this kind of reconciliation.
Anandi remebering Shiv and talking about him was nice. I wish Nandini was also there to know how important Shiv was to her mother.