While it's a known fact that Aamir Khan has been actively involved with this project, even wife Kiran Rao has played a big part in the making of the film. Every time there is a crisis, Aamir Khan and friends of Kiran Rao, remember only one person and that's Kiran Rao. When Aamir Khan took over the reins of Taare Zameen Par as director, Kiran Rao was there at each and every moment, helping him out as an assistant.
Even during Jaane Tu Ya Jaane Na, it was Kiran who came to Abbas Tyrewala's rescue, when one of his assistant directors fell sick during shooting. Confirms a source from Aamir Khan Productions, "Kiran Rao is always there for everyone around whenever there is a crisis. She is an angel who steps in to help everyone around. She had stepped forward to help Aamir and his team, on Taare Zameen Par and now extended her support even for Jaane Tu...Ya Jaane Na. It so happened that Abbas and gang were shooting in Mumbai when the first assistant director fell seriously sick in middle of shoot.
So, Abbas in panic made calls to all his friends to check if someone could step in to help. First assistant director is integral to the shoot and without that person it is quite impossible to shoot. When Kiran Rao heard of this, she called up Abbas and said that she would join him immediately. She is truly an angel who steps in to help everyone around"
It may be recalled that Kiran had even flown to Jaipur to help Rakeysh Omprakash Mehra during the shooting of Dilli 6 when one of his A.D.'s had to rush home. Seems like Kiran indeed believes in the saying 'A friend in need is a friend indeed'.