Staying in Chicago.

Abby Elliott, who currently plays Jeremy Allen White’s fictional sister on “The Bear ,” has found a new onscreen sibling in Sarah Snook. The actors now star together in Peacock’s “All Her Fault,” which premieres Thursday.

“She’s a younger sister,” Elliott, 38, told The Post about her character, Lia.

“I’m an older sister in real life, but I really loved playing her. She’s kind of a loose cannon. She has this history of being a drug addict. That was really interesting for me, because I thought of the younger siblings in my life and how they’re kind of trying to prove something, and make their voices known.”

Now streaming, “All Her Fault” is a thriller about Marissa Irvine ( Snook, “Succession” ), a mother frantically searching for her missing 5-year-old son, Milo

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