What was the common link of friendship between the author and his grandmother? How did the grandmother behave when their friendship was snapped?

Explanation

The author and his grandmother were living together in the village. Both cared for each other. And it was the common link of friendship between them. When they were in the village, she used to help the author in every way. But when they went to the city, there came a turning point. Now she could not go to school with the author and help him with his lessons. She was disturbed to know about the teaching of music. After this, she did not complain but became silent. She rarely talked to him. When the author went to university, he was given a room of his own. The common link of friendship was snapped. The grandmother accepted her seclusion with resignation. She took spinning-wheel from sunrise to sunset and recited prayers. In the afternoon she used to feed the sparrows.