Genealogy 101

Now that we have the basic terms explained, it is time to look at the ‘half’, ‘step’ and ‘in-law’ relationship terms.

Half-brother or Half-sister
Siblings who have the same mother or father, but not both.

Step-brother or Step-sister
Siblings who have neither the same mother or father.

Step-father
Your mother’s husband, but not your father.

Step-mother
Your father’s wife, but not your mother.

Step-brother or Step-sister
The child of your step-father or step-mother, but not a child of your father and mother.

Step-Son or Step-daughter
The child of your husband or wife, but not your child.

Spouse
Your husband or wife.

Brother-in-law
The brother of your spouse or the husband of your sister.

Sister-in-law
The sister of your spouse or the wife of your brother.

Father-in-law
The father of your spouse.

Mother-in-law
The mother of your spouse.

Son-in-law
The husband of your daughter.

Daughter-in-law
The wife of your son.

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