Gertrude Fairweather is a woman who lives in a small house just west of Varrock and south of the Cooks' Guild. She is the character to whom players must talk to begin both Gertrude's Cat and Ratcatchers quests. She also plays a minor role in A Tail of Two Cats.
After completing Gertrude's Cat, Gertrude gives you 1
kitten for free. If you lose your cat, you may buy another kitten from her for 100 coins. She won't sell you more kittens if you can start or have just started Ratcatchers, since she will only talk to you about the quest until you finish it.
activated ring of charos you can choose the colour of your new kitten. Doing this is required to complete the Varrock achievement, A Lick of Paint.
In the alternate version of Gielinor featured in
Dimension of Disaster, she runs a shop in New Varrock stocking stew and chocolate cake. She is also involved in the achievement Mummy Returns, which involves returning the reanimated body of Fluffs to her.
Gertrude has 4 children,
Shilop, Wilough (both of whom are featured in Gertrude's Cat quest), Kanel and Philop (neither featured in a quest). She also lives with Caleb Fitzharmon. Her husband was Walter Fairweather, a travelling merchant.