I checked out Mary Elizabeth McGlynn's page, and I came across a wrong information in the Trivia Section. It says "Mary has a twin sister called Melissa". The name "Melissa" is only her pseudonym (pseudonym is another different name for an individual which is indirect to his/her real name, so she may have used it to hide her real Identity) which she used in several songs in the Silent Hill horror series. Aside from being credited as "Melissa Williamson", she has also been credited as "Anna Top".
I' ve also deleted the wrong information in her page's trivia section that says about her twin sister.