Who lives in the old shingled house in the back of the woods in A Wrinkle in Time?

In "A Wrinkle in Time," the old shingled house in the back of the woods is inhabited by Mrs. Whatsit, Mrs. Who, and Mrs. Which, who are celestial beings with special powers. They assist the main characters, Meg Murry, Charles Wallace, and Calvin O'Keefe, on their journey to rescue Meg's father. The house serves as a gathering place for these characters, who help guide the children in their quest against evil forces.