<sod >Katie Stayâs younger sister, Aubrey Westwood, also shared a few messages from Cassidy, saying that her sister Emily loved Hello Kitty, and Rebecca's nickname was Becca Boo, except on the Wii, where her user name was 'coconut.< eod>< sod > Cassidy Stay could barely hold back the tears as she saw the coffins buried Katie Stayâs younger sister, Aubrey Westwood, also shared messages from Cassidy, saying that her sister Emily loved Hello Kitty, and Rebecca's nickname was Becca Boo, except on the Wii, where her user name was 'coconut.< eod>