Rabindranath's family life

Immediately after Mrinalini's death, even when Renuka, his second daughter was seriously ill and he had taken her for a change of scene to Almorah via Hazaribagh and Giridi, and he felt restless and anxious, he never became too perturbed by worldly disturbances. Bangadarshan ran on schedule. But his mind was filled up with publishing his Kabya Granthas.
Sishu was prepared at this time with the help of Mohit Chandra Sen.  After reading the volume, Sen's wife, Shusila Devi, asked Rabindranath to explain why Khoka was so ubiquitous and there was no Khuki. Shusila Devi had two daughters and no son.
Rabindranath replied that at that time the sweet memory of  his wife and his son inspired him to write the poems.