Mrs Fourmile

Mrs Fourmile is Jeffrey Fourmile's mother. She is an unseen character and is only heard of twice. Jeffrey is her only child and she has two grandsons, Tristram, and Tarquin. 
She was married, but her husband (Jeffrey's unmentioned father) has obviously since died.
She lives in a large detached house, and has 6 cats, named Sammy, Marmalade, Tiddles, Ginger, Smokey and Fluff. She is colour blind, and makes Tristram recite his times-tables before he has any pudding. She also checks behind his ears 'to see if there are any potatoes grow'.
In 1968, Mrs Fourmile becomes a grandmother when Jeffrey's wife Ann gives birth to a boy, who they name Tristram.
At an unknown date, she gave Jeffrey a blue and red striped tie, much to his disgust.
In December 1977, Jeffrey, Ann and Tristram visit Mrs Fourmile, Jeffrey wearing the tie, Tristram plays draughts with his grandmother and wins much to his pleasure. Things take a turn for the worse though, when Ann accidentally sits on Tiddles, much to her annoyance. Ann apologises to Mrs Fourmile for sitting on her cat, but is miffed that she didn't say sorry to the cat.
In September 1978, Mrs Fourmile becomes a grandmother for the second time when Ann gives birth to their second child, again a boy, whom they name Tarquin.
In December 1978, Mrs Fourmile is on a skiing holiday in Switzerland, but when Ann's Aunt Cynthia dies, Jeffrey, Ann and Tristram go to her funeral, but they cannot take baby Tarquin with them as he will start crying all the way through it. They can't give him to Ann's mother as she will be at the funeral. The crisis is then solved when they give Tarquin to their neighbours George and Mildred Roper.