sibling-in-law

1- Sibling's spouse.
2- Spouse's sibling.

sibling-in-law.

by Simaduria July 26, 2024

co-sibling-in-law

Spouse's sibling's spouse.

co-sibling-in-law.

by Simaduria July 26, 2024

half-sibling-in-law

1- Half-sibling's spouse.
2- Spouse's half-sibling.

half-sibling-in-law.

by Simaduria July 27, 2024

half-co-sibling-in-law

Spouse's half-sibling's spouse.

half-co-sibling-in-law.

by Simaduria July 27, 2024

step-co-sibling-in-law

Spouse's stepsibling's spouse.

step-co-sibling-in-law.

by Simaduria July 27, 2024

sibling in outlaw

The sibling of a romantic partner you are not married by law to

"Now that I'm in a relationship with Amanda, Jerry is my sibling in outlaw"
"I'm going to commit some crime with my sibling in outlaw next weekend"

by totoroxi August 2, 2024

surrogate older sibling

A person who fulfills the vacancy to be the surrogate older sibling in a family where the oldest child has left home whilst the younger sibling(s) are still too young to move out. Such vacancies are commonly found on the Happy Family sticker in the rear windshield of the family car. This role often involves providing guidance, support, and companionship in the absence of the biological older sibling.

After my older brother left home for college, someone became the surrogate older sibling, helping me navigate school and life at home.

by Emotional Cruiser September 29, 2025