Family!

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Across
  1. 4. the mother of one's father or mother.
  2. 7. man or boy who shares one or more parents with another.
  3. 8. an aunt's husband.
  4. 10. female having only one parent in common with another person.
Down
  1. 1. a man who serves as sponsor for a child, such as at a baptism.
  2. 2. the sister of one's father or mother.
  3. 3. a female partner in a marriage
  4. 5. the son or daughter of an uncle or aunt.
  5. 6. a son of one's brother or sister.
  6. 9. a daughter of one's brother or sister.