what was the turning point in friendship of narrator and grandmother?

The turning point in the narrator's and his grandmother's friendship came when the author was summoned to the city by his parents. In the village, he and his grandmother had been going together to the school . His grandmother was also able to help him with his studies. However, things were different in the city . The narrator went to school in a motor bus . Also , his grandmother couldn't help him with his study of western sciences. As there were no stray dogs, Grandmother took to feeding sparrows. She continued to wake him up for school. However , the only link of friendship between them was their shared room .