Nuclear family consists on father, mother, and child(dren).
It has 4 vital functions to the functioning of society:
1.- Sexual relations (satisfies the sexual needs of its members).
2.- Reproduction (to ensure the protection of women during pregnancy and lactation).
3.- Education (allows the transmission and persistence of culture in families).
4.- Subsistence (through a division, by sex, of the activities needed for subsistence, it ensures the economic welfare of the family).