Step 1: Primary kin:
Primary kin are those with a direct, first-order relationship to a person, such as parents and children, husband and wife, and siblings; this is the closest degree of kinship.
Step 2: Secondary kin:
Secondary kin are the primary kin of one's primary kin, for example a father's brother, a mother's sister, or a spouse's sibling, a relationship one step removed from primary kin.
Step 3: Tertiary kin:
Tertiary kin are the primary kin of one's secondary kin, for example a father's brother's wife or a mother's sister's husband, a further step removed in the kinship network.
Step 4: Consanguineal and affinal kin:
Kinship is also classified by how the tie is formed: consanguineal kin are related by blood/birth (e.g. parent-child, siblings), while affinal kin are related through marriage (e.g. spouse, in-laws).
Final Answer:
Kinship relationships range through primary (closest, direct), secondary (one step removed) and tertiary (two steps removed) degrees, and are further classified as consanguineal (by blood) or affinal (by marriage), together mapping how closely any two people in a kin network are related.