Synonyms for Step sister:

• n.

  •kinsman (noun)
  • kinswoman,
  • kin.
  •kinswoman (noun)
  • kinsman.
  •relative (noun)
  • mother-in-law,
  • nephew,
  • cognate,
  • father,
  • relation,
  • agnate,
  • cousin,
  • stepparent,
  • sibling,
  • connection,
  • in-laws,
  • mother,
  • folk,
  • folks,
  • aunt,
  • sister-in-law,
  • sib,
  • brother-in-law,
  • niece,
  • uncle,
  • blood,
  • clansperson,
  • stepbrother,
  • grandparents,
  • kinsperson,
  • stepsister,
  • great-grandparents,
  • father-in-law.