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 Rat Catchersquests. 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.
With the activated ring of charos you can choose the colour of your new kitten. Doing this is required to complete the Varrock medium task, A Lick of Paint.
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, although the exact nature of their relationship is unknown.