#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"
  member of:  family_unit
  subtype:  half_blood  on of siblings who have only one parent in common
  subtype:  quadruplet__quad  one of four children born at the same time from the same pregnancy
  subtype:  quintuplet__quint__quin  one of five children born at the same time from the same pregnancy
  subtype:  triplet  one of three offspring born at the same time from the same pregnancy
  subtype:  twin  either of two offspring born at the same time from the same pregnancy
     subtype:  fraternal_twin__fraternaltwin__dizygotic_twin__dizygotictwin  either of two twins who developed from two separate fertilized eggs
     subtype:  identical_twin__identicaltwin__monozygotic_twin__monozygotictwin__monozygoustwin  either of two twins developed from the same fertilized ovum (having the same genetic material)
        subtype:  Siamese_twin__conjoined_twin__conjoinedtwin  one of a pair of identical twins born with their bodies joined at some point
  subtype:  female_sibling  a person's sister
     subtype:  sister__sis__si  a female person who has the same parents as another person; "my sister married a musician"
        subtype:  big_sister__bigsister  an older sister
        subtype:  little_sister  a younger sister
        subtype:  half_sister__stepsister  a sister who has only one parent in common with you
  subtype:  male_sibling  a sibling who is male
     subtype:  blood_brother.male_sibling__bloodbrother__brother  a male with the same parents as someone else; "my brother still lives with our parents"
        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

No statement uses or specializes sibling; click here to add one.