Every individual who belong to a nuclear family finds his primary kins within the family. There are 8 primary kins- husband-wife, father-son, mother-son, father-daughter, mother-daughter, younger brother-elder brother, younger sister-elder sister and brother-sister.
Outside the nuclear family the individual can have 33 types of secondary relatives. For example mother's brother, brother's wife, sister's husband, father's brother.
Tertiary kins refer to the secondary kins of our primary kins.For example wife's brother's son, sister's husband's brother and so on. There are 151 types of tertiary kins.