This and several other snippets related to veteran actor find mention in a book "Shashi Kapoor: The Householder, The Star", written by Aseem Chhabra and published by Rupa Publications.
The author quotes Sharmila Tagore as telling him: "Shashi and I were in Jaipur for 'Paap Aur Punya'. My son, Saif, who was just two years old, was with me, as were Shashi's wife and kids. The Kapoors would take my son around, and Shashi, I imagine, spent time playing with him - because soon, Saif grew quite attached to 'Shashi Uncle'.
Shashi was born on March 18, 1938 at Calcutta. He was given the name Balbir Raj - in keeping with the Kapoor family tradition of adopting the word 'Raj' (or 'king') in its many variations.
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There is another nugget featuring Shashi and Sharmila in the book.
"Shashi's unannounced visit to the sets of 'Kashmir Ki Kali' unnerved 18-year-old Sharmila. 'We were shooting the song 'Isharon Isharon Main Dil Lenewale', and I said to myself, 'Oh my god! This is Shashi Kapoor. And I couldn't work," the author says, adding director Shakti Samanta finally asked Shashi to leave.
According to co-actor in eight films Shabana Azmi,
Shashi's good looks went against him.
"Because the first impression was that of a strikingly attractive man, people would forget what a fine actor he was!"
The book also says that on Sundays, the Kapoors of Napean Sea Road would take a family trip to Prithvi Jhonpra - Prithviraj Kapoor's residence in the Janki Kutir area of Juhu. Prithviraj's neighbour was the poet Kaifi Azmi, Shabana's father.
Under Shashi's guidance, Shabana, for the first time, learnt the brass tacks of mainstream cinema. While shooting for "Fakira" in Kashmir, Shabana - a gold medallist in acting from Poona's Film and Television Institute of India (FTII) - struggled to look at light reflectors.
Then, Shashi taught her about top lighting, which, under the wrong circumstances, can make an actor's eyes disappear and give her a ghost-like appearance. "He told me, if you have to shoot with a top light, you have to tilt your face upwards, so that there is less of a shadow," Shabana says.
The 1970s phase of Shashi's career must also be acknowledged because it witnessed the birth of a phenomenon that came to be known as Shashitabh - Shashi and Amitabh would become one of the most successful two-hero combinations in Indian cinematic history.
Shashi and Amitabh acted together in 14 films - including, strangely enough, as twins in Manmohan Desai's "Suhaag" and Shashi soon came to be referred to as Amitabh's favourite heroine.
The book also says how Raj Kapoor used to call his brother 'taxi'. Raj Kapoor used the word 'taxi' to describe his brother when he was desperately trying to get dates from Shashi for "Satyam Shivam Sundaram".