They all took the surname Singh, meaning  Lion  (all Sikhs are named Singh, but not all Singhs are Sikhs), and wore a turban and kept the five K' kesha (uncut hair and beard), kanga (comb for their hair), kara (steel bracelet), kachha (soldier's shorts), and kirpan (dagger).
The surname Singh was acquired by all of them.
Soldier's shorts and a dagger was not worn by any of them.
A man and two girls are posing in front of a cityscape.
A boy is playing with a tennis ball
That is positive.
An old man with a beard is sweeping with a broom.
A person is using a hole puncher while another uses the copy machine.
3 was not worried about the fictional aspects of their book.