#sister__sis__si  a female person who has the same parents as another person; "my sister married a musician"
  exclusion:  blood_brother.male_sibling
  supertype:  female_sibling  a person's sister
  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

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