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"Cousin" describes a family relationship in which two people are descended from the same ancestor, other than from a parent. There is no precise "opposite" to Cousin the way "night" is the opposite of "day", but many people have used "cousin" indescriminately to describe anyone who is not a parent, grandparent, child, or sibling, but who is related to them. In that general sense, then, the opposite of "cousin" would be "unrelated." There really is no opposite word; the opposite of a paternal cousin is a maternal cousin.
The word cousin means your mom's or dad's sister or brother's child
brother
Your brother's cousin is also your cousin.
The English language does not use the phrase "cousin brother." The brother of your cousin is also your cousin.
Nephew is the opposite of cousin
A step brother's cousin is no relation to you.
Your cousin's brother is also your cousin, but the cousin's wife is not related to you.
Well, your cousin's brother is also your cousin, and a cousin's son is also your cousin.
The brother of your wife's cousin is also her cousin. You can call either of them "my wife's cousin." You are not related to them.
All of your cousins are also cousins of your brother.
A cousin brother means , the son of the father or mothers , brother or sister.