Blood and non-blood relations

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Across
  1. 3. a daughter of one's step-parent by a relationship other than with one's own father or mother
  2. 6. a daughter of one's son or daughter
  3. 7. the son of one's son or daughter
  4. 8. the man who is married to your son or daughter
  5. 13. a sister with whom one has only one parent in common
  6. 14. the father of one's grandmother or grandfather
  7. 16. a brother with whom one has only one parent in common
  8. 17. the mother or father of one's grandparent
  9. 19. a daughter of one's brother or sister
  10. 20. the mother of one's husband or wife
  11. 21. a son of one's brother or sister
Down
  1. 1. a woman who is the wife or partner of one's parent after the divorce or separation of the parents or the death of one's mother
  2. 2. the sister of one's husband or wife
  3. 4. a child of one's son or daughter
  4. 5. the mother of one's grandmother or grandfather
  5. 9. a son of one's step-parent by a relationship other than that with one's own father or mother
  6. 10. the woman who is married to your son or daughter
  7. 11. the brother of one's husband or wife
  8. 12. a man who is the husband or partner of one's parent after the divorce or separation of the parents or the death of one's father
  9. 15. one of two children or animals born at the same birth
  10. 18. the father of one's husband or wife