Who is Aunt Annie from Crow Lake and what is their importance?

Aunt Annie is Mr. Morrison's sister. Unmarried, she lives with her father and cares for him while he works the farm. Aunt Annie comes to stay with the children after their parents' deaths. She takes charge of the household and arranges for the children to be sent to separate family farms, freeing Luke to attend teacher's college. Those actions are overruled, however, when Luke takes custody of the children. Aunt Annie cares for the children and worries about their future, but she is forced to leave them in Luke's custody.