Katie Capper (born February 4, 2023) is the identical octuplet sister of Maria, Nicole, Leslie, Emma, Annie, Angela and Katie and a daughter of Ian and Claire, who own a cookie business.
- Father: Ian Capper (1993-)
- Mother: Claire Capper (née: Nixon) (1995-)
- Sisters: Katie Capper (2023-), Maria Capper (2023-), Nicole Capper (2023-), Leslie Capper (2023-), Emma Capper (2023-), Annie Capper (2023-), Angela Capper (2023-)
- Aunts: Sadie, Melody, Flo, Angie, Tiffany
- Uncles: Eric, Kyle, William, Isaac
- Cousins: Kolben Capper, Carol Capper, Dakota Capper, Mary-Leah Capper, Stanley Capper, Tabby Capper, Kenny
- Grandmothers: Ashley Capper (née: Weasley ; -), Victoria Nixon (née: Brewster ; -)
- Grandfathers: Walton Capper ( -), Clyde Nixon ( -)
- Her full name is Natalie Nevaeh Capper
- In Christmas 2026, she opened her presents to reveal a purple sweater, Rotten Ralph's Rotten Chritstmas book, a pink convertible ride-on car, a pair of cowboy boots, a swing set, a trampoline, a doll, a box of cookies. And in her stocking, she found a Mickey Mouse plush toy, a pair of slippers, a Barbie doll, a box of crayons, a coloring book, a jump rope, play-D'oh, and bath toys.