Family relations and parts of a house

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Across
  1. 7. the son or daughter of your aunt or uncle
  2. 8. a room under the house
  3. 9. the father of your mother or father
  4. 16. where you walk to a higher floor
  5. 17. the daughter of your brother or sister
  6. 18. a living space with many people and families living in one building
Down
  1. 1. where you walk to a lower floor
  2. 2. steps where you go to a different floor
  3. 3. an outdoor space in a flat
  4. 4. a place where many people live
  5. 5. the brother of your mother or father
  6. 6. the mother of your mother or father
  7. 8. the son of your mother and father (not you)
  8. 10. a living space for one family
  9. 11. the son of your brother or sister
  10. 12. the daughter of your mother and father (not you)
  11. 13. a place where only a few people live
  12. 14. the sister of your mother or father
  13. 15. an electronic box where you ride to a different floor