parentesco

noun
  1. The relationship or connection by blood or marriage between individuals; kinship. noun
    The parentesco between the two families was evident at the reunion.
    Understanding the parentesco can help trace family lineage and heritage.
  2. A similarity or connection between things, often used metaphorically. noun
    There is a parentesco between the two theories that suggests a common origin.
    The parentesco in their ideas was striking, despite their different backgrounds.