A Group of Friends Live near Each Other and Babysit

A group of friends live near each other and babysit each other's children. They support each other when problems occur, and they cheer each other on. How would this group of friends be defined based on the institution of family?

A) Their emotional bonds would create a legal family connection.
B) Members of the group who rely on other members for help could be considered dependents.
C) Close friends can be considered family, but not legally.
D) Unless there is a head of the household, there is no family.