Birth Name: Sadie Elizabeth Sink
Place of Birth: Brenham, Texas, U.S.
Date of Birth: April 16, 2002
Ethnicity: English, Irish, German, Scottish, possibly other
Sadie Sink is an American actress. She co-stars on Stranger Things, and is also known for her roles in the Fear Street trilogy of films, Eli, The Whale, Dear Zoe, and the show American Odyssey.
She is the daughter of Lori, a math teacher, and Casey Sink, a football coach.
Sadie’s paternal grandfather is Joseph Edward Sink III (the son of Joseph Edward “Joe” Sink and Betty Joyce O’Brien). Sadie’s great-grandfather Joe likely was the son of Joseph E. “Joe” Sink and Nell/Nellie Alma Armstrong. Betty was the daughter of Ernest Eugene O’Brien and Linnie Mae Johnson.
Sadie’s paternal grandmother is Shirley Jean Robertson (the daughter of John Arthur Robertson and Cora Belle Hoff).
Sadie’s maternal grandfather’s surname is Baughman.
Source: Obituary of Sadie’s paternal great-grandmother, Betty Joyce (O’Brien) Sink – https://www.legacy.com