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|Birthday||18th of an unknown month with 31 days
|Hair color||Medium Brown (youth and adulthood)|
Gray (elderly years)
|Favorite color||Green apple|
|Residence||Thora's childhood house (formerly)|
Grandma Thora's House, Elwood City
|Family||Thora's father (father)|
Thora's mother (mother)
Thora's brother 1 (brother)
Thora's brother 2 (brother)
Thora's brother 3 (brother)
David Read (son)
Jane Read (daughter-in-law)
Arthur Read (grandson)
D.W. Read (older granddaughter)
Kate Read (younger granddaughter)
Loretta's daughter (granddaughter)
David's brother (son)
Thora's mother's great-uncle (great-great-uncle)
|Book debut||Arthur's Christmas|
|Cartoon debut||"Arthur's Spelling Trubble"
She is shown to be very kind, supportive, and understanding, but is also a poor cook. She loves bingo and is best friends with Mrs. MacGrady, lunch lady for Lakewood Elementary. She sometimes babysits her grandkids such as on New Year's Eve, when she allowed D.W. to stay up until midnight not knowing that D.W.'s parents already told her that she couldn't. She's also very good at playing marbles and gives Arthur some lessons on how to play the game well. In Family Fortune, she goes to an antique show with two of her grandchildren.
She has a prized doll named Clarissa (shown in Clarissa is Cracked). In the same episode, it is revealed that she has three older brothers. She also takes in a stray dog named Killer that was found on her porch. It's never been revealed who her husband (the father of David and his siblings and the paternal grandfather of Arthur and his sisters), as he's never been seen--it's likely that Thora's widowed.
- Season 1
- Season 2
- Season 3
- Season 4
- Season 5
- Season 6
- Arthur Loses His Marbles 61001
- Season 7
- Season 8
- Season 9
- Season 10
- Season 11
- Season 12
- Season 13
- Season 14
- Season 15
- The Last King of Lambland (Cameo) 150302
- Season 16
- All About D.W. 160301
- Season 17
- Dog's Best Friend 170102
- Season 19
- Arthur's Toy Trouble 190301
- Season 20
- That's MY Grandma! 200402
- Season 21
- She is named after author Marc Brown's own grandmother, Thora Brown.
- When she was a child, Thora had a close resemblance to D.W.
- In "D.W., the Picky Eater," it is revealed that Thora's birthday is on the 18th day of an unknown month with 31 days (there are 7).
- In "April 9th," David explains that when he was Arthur's age, Thora got into a car accident (though she wasn't hurt). For a time afterwards, David feared that Thora would get into another car accident.
- She originally is known to be a bad cook, but in later episodes she has been shown to be cooking better.
- In publicity/promotional materials, she is typically referred to as "Grandma Thora."
- In "Clarissa is Cracked," it is revealed she is a columnist.
- She was the one who gave Arthur his iconic yellow sweater.
- Thora's maiden name has never been revealed and it's never explained who her husband (the father of David and his siblings) was or if she was ever married.
- In "Buster's Best Behavior," Thora doesn't appear in the episode herself, Arthur transforms into her during the episode intro after he stole D.W.'s TV time.