bloodline vs heirship

bloodline

noun
  • The abstract link between a person and their ancestors. 

  • The pedigree of an animal. 

  • By extension, the predecessors of a particular item or product. 

heirship

noun
  • The status of being heir to something or someone 

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