Bearing in mind the existence or otherwise of the family nucleus the following types of family are considered:
Without nucleus
Single person: does not have a family nucleus and consists of only one person.
Compound: does not have a family nucleus either, and is formed by two or more persons, who may or may not be related.
Nuclear
Nucleus without children: a nuclear family made up of a couple without children.
Nucleus with children: a nuclear family made up of a couple with children who do not have their own nucleus.
Single parent: a nuclear family made up of a single father or mother with children who do not have their own nucleus.
Extended: a family nucleus of any kind in which one or several related members live together.
Polynuclear: two or more family nuclei.