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
Spouse's half-pibling's husband.
My half-co-uncle-in-law is a good person.
by Wonbig October 13, 2021
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My co-great-uncle-in-law is a good person.
by Elivaldeq November 24, 2019
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Spouse's steppibling's husband.
My step-co-uncle-in-law is a good person.
by Wonbig October 13, 2021