Why Aish refused to work with Jaya?

After a long time Jaya Bachchan and Amitabh Bachchan will be seen together in Deepak Sawant's film 'Leader'. In the film Big B will be playing the role of a school teacher and Jaya will be playing the role of his wife. Sawant is very excited about this film. The role of Ganga was offered to Aishwarya but if reports are to be believed, she has refused to work in the film. It is common knowledge that Aish is not taking any major project. The last we heard was that she will be working with Mani Ratnam and this would be her come-back film post motherhood. May be her pregnancy may be the reason of her inability to work in the film. But it is also a common knowledge that she is not very comfortable working with her mom-in-law. Though she has worked with Big B she is yet to share the screen space with her mom-in-law.