As preparation for his role of a paraplegic in Sanjay Leela Bhansali's Guzarish, the method actor has been moving around in a wheelchair at home. This is proving to be of amusement for his tots Hrehaan and Hridhaan.

A source close to Hrithik reveals, "As he wants to appear natural on screen, he has taken it up as a challenge to get his nuances for the character right."

In the movie, the upper half of his body is paralysed. Hrithik is not only working on acquiring the right moves on the wheelchair, but also giving attention to the way a paraplegic talks, looks and reacts. He has also been reading books to understand the psyche of paraplegics."

The source continues, "But his learning sessions at home are providing much mirth to his sons. They cart him around the house or insist on sitting on his lap while he wheels himself around."

Earlier too, for his role of a mentally challenged character in Koi... Mil Gaya, Hrithik had also done plenty of research to mould himself into the character.

It is learnt that Bhansali has also given him a list of guidelines to be followed.