In "I Know Why The Birds Caged Sing" Maya and her brother left Stamps because their father came visiting Momma at Stamps during Christmas and decided to take them to California to see their mom. So, they were taken from Stamp to California to see their mother.
Explanation:
When the parents of Maya divorced, Maya and her brother, Bailey were sent to Stamps to stay with their father's mother (their grandmother). They stayed in Stamp until one Christmas their father visited to take them to California to see their mother.
"I Know Why The Caged Bird Sings" is an autobiography of Maya Angelou.