The term is also used more loosely to describe a group with some form of common characteristic or a group with a relationship (other than ancestral).
The traditional western view of a family is a mother, a father, and children.
Many families do not have both parents as part of the family unit. These are known as single-parent families. In some cultures, a family includes grandparents, uncles, aunties, cousins and other people as part of the core family group.