family jewels

keep it in the family

To restrict knowledge or information to only the members of a family or another small, intimate group.

one big happy family

A group of people who get along well together.

run in the family

To be a characteristic feature that is observed in several generations of a family.

sell the family silver

To sell one's property (not necessarily heirlooms) in an attempt to avoid or escape financial difficulties.

start a family

To conceive one's first child