The correct answer to this open question is the following.
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So here we go.
In general terms, a family is defined as a set of people related by blood, marriage (or some other agreed-upon relationship), or adoption who share the primary responsibility for reproduction and care of members.
For example, my family. Mother, father, my brother, and me.
That is the nucleus of my family. My father goes to work and provides anything necessary to take care of the family: food, shelter, school, athletics, and entertainment. My mother stays at home and raised my brother and me. Now she is able to go to work part-time.