Your brother's or sister's brother-in-law, or your niece's or nephew's other uncle(s) that aren't your brothers.
Jonathon and I aren't blood related, as his sister married my brother, but we are co-uncles to Jack and Caroline.
by OneEyedWilvis January 20, 2009
Get the co-unclemug. 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 January 20, 2009
Get the co-auntmug.