#sibling__sib  a person's brother or sister
  supertype:  #relative__relation  a person related by blood or marriage; "police are searching for relatives of the deceased"; "he has distant relations back in New Jersey"
  subtype:  #half_blood  #quadruplet  #quintuplet  #triplet  #twin {#female_sibling #male_sibling}
  member of:  #family_unit__family  primary social group; parents and children; "he wanted to have a good job before starting a family"

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