Final answer:
Biddy moves in to help nurse Mrs. Joe in chapter sixteen of Great Expectations.
Step-by-step explanation:
In Great Expectations chapter sixteen, Biddy moves into the forge to help nurse Mrs. Joe after her attack. She is known for her kindness and patience, which makes her a suitable caregiver. Unlike Estella and Miss Havisham, who are associated with the higher social class and Satis House, Biddy represents the warmth and simplicity of the village life. Joe, being Mrs. Joe's husband, is already present in the household, but it is Biddy who steps in to take the role of a nurse.