That has to be it. I’ve not thought about it for some time. And I googled that “cousin” is only used in the KJV; I’ve got 3 or 4 different translations and can’t work from them all from memory.
At the time of the KJV, the word cousin meant "kinsman," more or less -- someone who belongs to the same clan or extended family. That's how it's often used in Shakepeare, which was written at about the same time.