My Sister the Vampire Revamped by Sienna Mercer

The secret is out – cheerleader Olivia and vampire Ivy are twins! Now that Ivy and Olivia have told their friends, its time to come clean to their adoptive parents. But Ivy’s dad doesn’t want to meet Olivia! Even worse, Ivy and her dad are moving to Europe. They need to change his mind quick! When the vampire officials realise that Olivia knows the truth about vampires, they demand that she pass three tests to prove she can be trusted. But these aren’t any old tests, and they’re guaranteed to get the blood pumping! They included the Test of Darkness, the Test of Faith and The Test of Blood. Yikes! Can Olivia pass all three? If she doen't then her memory will have to be erased. Then there is the Dad thing to worry about as well. The third fangtastic tale in the My Sister the Vampire series by Sienna Mercer. Check it out! A great vampire series with tween twins.