Cerin

Cerin (C/assie and Erin) is the friendship of Cassie and Erin. When moving into the Anubis House in The Touchstone of Ra, it seems that they're sharing a room. Also, in the special Anubis Unlocked: The Touchstone of Ra, it shows Cassie and Erin under a table. It's possible that Cassie and Erin are very different, as in it's possible that Erin's strives to be intelligent as you can see in The Touchstone of Ra she's hanging up a poster of The Periodic Table of Elements, and that Cassie is very fashionable as you can see in The Touchstone of Ra, as she brings a lot of clothes with her to the house.

The Touchstone of Ra

 * They both appear as new students that are moving into the same house, Anubis House.
 * They both share the same room.
 * They both hide under a table.