quarter brother

my half-brother's half-brother

Jason and Lydia's son is Sam. Clai and Lydia's son is Will. Jason and Maureen's son is Davis. Will and Davis are quarter brothers.

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three-quarter-brother

Son of a person's father with that same person's maternal aunt or son of a person's mother with that same person's paternal uncle.

My three-quarter-brother is a good person.