Kitty

Kitty Tyler is the wife of Josh Tyler, mother of her two twin daughters Becca & Lindsey, as well as friends with Adelaide Wilson and her family in the 2019 film 'Us'.

Meeting the Wilsons at the Beach
Kitty Tyler makes her first appearance with Josh Tyler at the Santa Cruz beach, where she converses with Adelaide Wilson. While she has this conversation, we are clued in on her hatred towards Josh, as she mentions that she fantasizes about murdering him. When Josh offers her a drink, she tells him that she hates him (most likely in a sarcastic way).

Kitty Tyler is also known to have had plastic surgery, as she mentions to Adelaide Wilson that she got something small done to her face that hasn't altered her appearance greatly.

Kitty is bubbly and talkative, making conversation with Adelaide Wilson at the beach. She also seems relatively kind, as she tells Adelaide she can understand her unwillingness to talk, and also assures her that she doesn't need to get anything done, calling her a 'whore' in an affectionate manner. We can also assume that she is scared easily, given her concern about the rustling outside of her house.

Kitty has had a past as an actress, but claims that she gave up her dream because she gave birth to Becca & Lindsey. She hints at wanting to return to that dream while talking to Adelaide.

She appears to be struggling with her relationship with Josh Tyler, as she makes jabs at him multiple times throughout the course of the movie, and finds his antics unappealing. She is also more aggressive towards him than she is towards any other character.

Death
When the Tethered/Doppelgängers of the Tylers make their appearance, Kitty Tyler watches Becca & Lindsey Tyler die at the hands of Io and Nix, before she is murdered by Dahlia.

Before Kitty dies, she can be seen crawling towards the deceased Josh Tyler as her throat bleeds out. Tex steps in front of her, and she can be seen grabbing at his sandals as he offers a hand to her, only to reveal that he was faking her out.

Kitty asks Ophelia to call the police, who accidentally mistakes her request for playing 'Fuck the Police' by N.W.A..

After the song begins to play, Dahlia slits her throat again to ensure that she dies.

Post-Mortem
When the Wilsons come to the Tyler house for help, they see Kitty dead on the ground through the windows.

Trivia

 * Her actress Elisabeth Moss is known for portraying June Osborne, the main character in the Hulu original series The Handmaid's Tale. Elisabeth Moss would later portray Cecilia Kass in the 2020 The Invisible Man remake, also made by Blumhouse.