Kin-war
Referring Kin (family) War (conflict)

1. A war between countries that are the same immediate family and blood.

2. Countries that were previously the same country and are now at war.

3. Brother against brother, sister against sister, blood against blood.
Since Civil War is used for internal conflict of a country usually explained as brother against brother. There is no word known for countries at war which are family.

There is a kinwar between Ukraine and Russia currently.

The El Salvador-Mexico conflict was referred to as a Civil War but only because there is no word for what it actually was, a kinwar.

This word was submitted into the official language of English, if you find it is approved or want to support its approval; contact the dictionary people.
by Jethro Hackworth September 23, 2023
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