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.
by OneEyedWilvis October 9, 2008
My co-aunt-in-law is a good person.
by Gerald128 April 6, 2021
My half-co-aunt-in-law is a good person.
by Wonbig October 13, 2021
My co-great-aunt-in-law is a good person.
by Elivaldeq November 24, 2019
My step-co-aunt-in-law is a good person.
by Wonbig October 13, 2021
My first co-cousin-aunt-in-law is a good person.
by Elivaldeq November 24, 2019
My co-aunt-in-law is a good person.
by Wonbig October 13, 2021