A nanny and a mother's helper are both individuals who assist with childcare, but they differ in their roles, responsibilities, and levels of independence:

Nanny:

- Role: A professional caregiver who typically works independently and may live with the family or commute daily.

- Responsibilities: Full or part-time childcare, including feeding, bathing, supervising activities, homework help, and sometimes light household chores related to the children.

- Expectations: Often responsible for the children’s daily needs and can perform a wide range of duties related to childrearing.

- Independence: Usually works independently and is trusted to manage the children’s care on their own.

Mother’s Helper:

- Role: Assists the mother with childcare and household tasks, usually under her supervision.

- Responsibilities: May include watching children while the mother does chores, playing with children, preparing snacks, or light housekeeping.

- Expectations: Works alongside or under the supervision of the mother, offering support rather than full responsibility.

- Independence: Typically less independent; the helper is there to assist the mother and may not be left alone with the children.

In summary: 

A nanny is generally a more independent, full-time caregiver responsible for the children’s care, while a mother’s helper provides support and assistance under the mother’s supervision, often on a part-time or temporary basis.