Siddiqui will play the role of Sridevi's husband and Ali's father. Sridevi, who is also the producer, will play a lead role in this women-centric film, the Daily Times said.
The news of Ali's role broke a few weeks ago. It is now that a source has confirmed Siddiqui's participation.
Actor Akshaye Khanna will make a comeback with the movie while actor Nawazuddin Siddiqui will have a special appearance. The "Mom" team is now shooting in Georgia, the daily said.
Siddiqui also played a small role alongside actress and filmmaker Angelina Jolie and actor Irrfan Khan in the 2007 film "A Mighty Heart".