The two siblings and their non-custodial, biological mother are all missing from the Gaithersburg area of Montgomery County, Maryland. Catherine has black, shoulder length hair, and she was last seen wearing a black tank top and blue jeans. Sarah is biracial, with medium length brown hair, and she was last seen wearing a pink tank top and blue shorts. Jacob is biracial, with a curly blonde Afro, and he was last seen wearing a white t-shirt and blue shorts.