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What is my half-brother's half-brother to me?

Your half-brother's half-brother can be you (if you are male), your half-brother or your stepbrother. It depends on which branch of the family you mean.

Diagram: how your half-brother's half-brother is related to youYouOne parentshared ancestor (half)Half-brotherthem
If he is your half-brother
Diagram: how your half-brother's half-brother is related to youYouParentStep-parentStepbrotherthem
If he is your stepbrother

you them common ancestors double line: marriage

It depends on which parent they share. Through the parent you share, his half-brother is you or another half-brother of yours. Through his other parent, his half-brother isn't related to you by blood; he's like a stepbrother.

How we worked it out

Follow the chain one step at a time:

  1. Your half-brother: half-brother (1 up, 1 down)
  2. Your half-brother's half-brother: you or half-brother or stepbrother

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    Related questions

    What is my half-brother's mom to me?
    Your own mother, if she's the parent you share; otherwise your father's partner or wife (a stepmother if they married).
    How much DNA do half-siblings share?
    About 25% on average, half the 50% of full siblings.

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