Ranbir Kapoor who is ready to play Sanjay Dutt in his biopic, was seen spending some quality time with the actor's kids. Dutt's wife Manyata took to her Instagram account to share of photo of the 33 year old with the children. Talking about the movie lately, Sanjay said, “My biopic is being made and Raju Hirani is directing it. I won't act in it. Ranbir Kapoor will. So it will be a problem for him because he will have to grow his hair, will have to get lean and then make body. It's a challenge for an actor.”