Loretta's daughter (sister)
Thora's father (great-grandfather)
Thora's mother (great-grandmother)
Thora's Brother 1 (great-uncle)
Thora's Brother 2 (great-uncle)
Thora's Brother 3 (great-uncle)
Thora Read (grandmother)
David Read (uncle)
Jane Read (aunt)
Arthur Read (cousin)
D.W. Read (cousin)
Kate Read (cousin)
David's brother (uncle)
|Cartoon debut||"Arthur's Cousin Catastrophe"|
However, at the reunion in "Arthur's Cousin Catastrophe", she is much nicer to him. After seeing Arthur play piano at past reunions, she decided to learn how to play. She also reveals to Arthur that he's her favorite relative and that the only reason she comes to the reunion is to play with him, especially on the piano.
Mo is depicted with a tan complexion, auburn shoulder-length hair and parted bangs, and wears a white shirt with the red R + R on the front, a bluish-gray denim jacket with front pockets, bluish-gray pants, and black sneakers with white accents. From the past reunions: she wore her hair in pigtails and straight-down bangs and was wearing a bright green shirt with buttons, bluish-gray shorts, white socks with bright green loops, and pale-red sneakers when spinning Arthur on a lawn sprinkler; her hair was shoulder-length and straight-down bangs, and she was wearing a white martial arts uniform with a yellow belt when doing judo on Arthur; and her hair was slightly longer than at her shoulders, and she was wearing a yellow shirt with purple overalls when she dressed Arthur as a baby. After those three reunions, her voice has grown somewhat deeper.
- She is a skilled pianist.
- In "Just the Ticket", she is seen seating Arthur and George at the radio show. It is unknown how she got the job, or why Arthur didn't acknowledge her.
- Season 1
- "Arthur's Cousin Catastrophe" (debut) 10902
- Season 10
- "The Curse of the Grebes" (cameo) 100601
- Season 11
- "Phony Fern" (cameo) 110401
- Season 12
- "The Chronicles of Buster" (cameo) 120501
- Season 17