half sister vs sib

half sister

noun
  • A female sibling sharing a single parent. 

sib

noun
  • A sibling, brother or sister (irrespective of gender) 

  • A group of individuals unilaterally descended from a single (real or postulated) common ancestor 

  • Any group of animals or plants sharing a corresponding genetic relation 

  • A kinsman; a blood relation; a relative, near or remote; one closely allied to another; an intimate companion. 

  • Kindred; kin; kinsmen; a body of persons related by blood in any degree. 

adj
  • Having kinship or relationship; related by same-bloodedness; having affinity; being akin; kindred. 

verb
  • To bring into relation; establish a relationship between; make friendly; reconcile. 

  • To engage in repetitive behaviors such as eye-poking, skin-picking, hand-biting, or head-banging. 

How often have the words half sister and sib occurred in a corpus of books? (source: Google Ngram Viewer )