Dev starrer Sanjhbati copied from Shabiprosad-Nandita's Gotro?

Shiboprosad Mukherjee and Nandita Roy's film Gotro has given a glimpse of its story in its teaser. The problem arises when Sanjhabati director Saibal Bandyopadhyay reveals the polt and it sounded similar to Gotro. Shiboprosad-Nandita's film revolves around an elderly woman who lives with her maid, a young girl whom she loves dearly. A young man gradually makes a special place in her heart for his caring nature. In Sanjhbati Lily Chakraborty plays a lonely woman, Paoli plays her maid and Dev plays her caretaker. The striking similarity didn't go unnoticed by Shiboprosad and he has sent a legal notice to Atanu Ghosh, the producer of Sanjhbati. So, do you think is Sanjhbati is copied from Gotro?