Hmp...I don't know, they do look-a-like and they do have the same last name.But guess what?I looked up Olivia Holt on wikipedia and it said she had an older sister that was NOT Claire! It's like Jane LYNCH and Ross LYNCH same last name but not related.I still think they are sister though!!
No, Claire Holt is Austrailian, while Olivia Holt is American. Claire does have a sister, but her name is Rachel Holt. Therefore Claire and Olivia are NOT related.