well before we continue let's get to know the characters for this story...

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Jung Family

Yunho- the father

Nicole- the mother

Allyane- twin sister

Alliene- twin sister 

The Park family

Yoochun- the father

Rose- the mother

Chanyeol- the son (cousin)

Gyuri- the sister (cousin)

The Kim Family

Jaejoong- the father

Saeri- the mother

Jongdae- the son (cousin to Allyane and Alliene)

Minseok- the eldest son (cousin to Allyane and Alliene)

Junmyeon- the son (cousin to Allyane and Alliene) also the one who who locked Allyane outside 

Jongin- the youngest son (the youngest cousin of the twins) 

ok I know that EXO are vampires but some of the members don't know that they are vampires as well so here's the 12 members 

EXO (VAMPIRE)

1. Xiumin (Doesn't know till later)

2. Luhan

3. Kris

4. Suho (acting as human)

5. Baekhyun

6. Lay

7. Chen (acting as human)

8. Chanyeol (doesn't know)

9. DO

10. Tao 

11. Kai (being the youngest doesn't know)

12. Sehun (also being the youngest he's like Kai) 

So there you have it hopefully there will be no miscommunication