Are the Calypso Twins sirens?

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Tags

1. #siren
2. #somehow
3. #trailer
4. #character
5. #around
6. #story
7. #sirens
8. #baddies
9. #calypso
10. #female
11. #twins
12. #wields
13. #powers
14. #brother
15. #despite
16. #sister
17. #beginning