co-aunt

Your brother's or sister's sister-in-law, or your niece's or nephew's other aunts that aren't your sisters.

Liz and I aren't blood related, as her sister married my brother, but we are co-aunts to the same children.

co-aunt-in-law

Spouse's uncle's wife.

My co-aunt-in-law is a good person.

half-co-aunt-in-law

Spouse's half-pibling's wife.

My half-co-aunt-in-law is a good person.

co-great-aunt-in-law

The wife of one's grandparent-in-law's brother.

My co-great-aunt-in-law is a good person.

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step-co-aunt-in-law

Spouse's steppibling's wife.

My step-co-aunt-in-law is a good person.

co-aunt-in-law

Spouse's pibling's wife.

My co-aunt-in-law is a good person.

co-aunt-in-law

Spouse's pibling's wife.

co-aunt-in-law.