It's All Relative

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Across
  1. 1. the father of one's mother
  2. 6. the mother of one's mother
  3. 7. female parent
  4. 8. the brother of one's mother
  5. 10. younger female sibling
  6. 11. male parent
  7. 13. the mother of one's father
  8. 15. the parent of one's grandparent
  9. 16. adult female person
  10. 18. the father of one's father
  11. 19. male child from birth to adulthood
Down
  1. 2. an extremely young child
  2. 3. female child from birth to adulthood
  3. 4. male offspring
  4. 5. adult male person
  5. 7. the sister of one's father
  6. 9. older female sibling
  7. 12. female offspring
  8. 14. younger male sibling
  9. 17. older male sibling