The Seething Sisters is a building released with the Level 54 update on June 17, 2015.
Seething Sisters is a is a restaurant and gas station. Ruth Powers dropped Marge off there so she could call home when they were being chased by the police. Inside Marge understood that she must stay with Ruth. When Marge came back to Ruth all the customers left the diner because Kearney had started a police siren on his bike.