How do targaryens have dragons?

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2. #valyrian
3. #family
4. #kingdoms
5. #seven
6. #effectively
7. #daenerys
8. #westeros
9. #dynasty
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13. #noble
14. #aegon
15. #using
16. #beginning
17. #dragons
18. #viserys
19. #answers
20. #invaded
21. #descendants
22. #technological
23. #royal
24. #called