#blood_brother.male_sibling__bloodbrother__brother  a male with the same parents as someone else; "my brother still lives with our parents"
  exclusion:  #sister
  supertype:  #male_sibling  a sibling who is male
  subtype:  #big_brother__bigbrother  an older brother
  subtype:  #little_brother  a younger brother; "my little brother just had his 50th birthday"
  subtype:  #stepbrother__half-brother  a son of your stepparent by a former marriage

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