Step-father's Day

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Across
  1. 1. Two people, the same and not
  2. 3. carriage for felines
  3. 7. Sometimes you eat the...
  4. 9. A program from Robert in Canada
  5. 11. flea, to a seagull?
  6. 13. Good with PB
  7. 14. etcetera
  8. 16. go by
  9. 18. the crossword name, in a way
  10. 19. Middle name of famous number theorist
  11. 20. hypothesis
Down
  1. 1. Name for a Wooza
  2. 2. three spaces?
  3. 3. Spice needed for a good Chi-chai
  4. 4. part of speech
  5. 5. Math Dad, long dead
  6. 6. First names of writer Rilke
  7. 8. tasteless
  8. 10. with rope and feet
  9. 12. main strength for a wizard
  10. 15. small
  11. 16. Without me, everything will go down the drain
  12. 17. Number of dice needed when dragons come calling