Amid row over Swedish activist Greta Thunberg‘s ‘kidnapping’ by Israel army when she was on her way to Gaza, a video of her reported sister went viral with social media users viciously trolling her. Beata Thunberg, known by her stage name Beara Mona Lisa, is seen singing in the video. Social media users have not held back in their criticism, with some suggesting a familial pattern of unusual behavior. “So the whole family is retarded?” read one comment. Others speculated about the influence of the Thunberg parents, with remarks like “When did Greta’s parents learn they were cousins?” while some doubted whether she was actually Greta Thunberg’s sister.Greta Thunberg’s sister does not use the Thunberg surname and adopted her mother’s maiden name.Born on November 3, 2005, Beata is the daughter of Svante Thunberg, an actor and producer, and Malena Ernman, an opera singer who represented Sweden in the Eurovision Song Contest. Unlike her sister, who has gained international fame for her environmental activism, Beata has pursued a career in music and performance art.On June 10, Greta Thunberg was aboard the yacht “Madleen,” part of the Freedom Flotilla Coalition’s effort to deliver humanitarian aid to Gaza and protest Israel’s ongoing military campaign in the region. The coalition aimed to challenge the blockade imposed on Gaza, which has been tightened during the Israel-Hamas war. Israeli forces intercepted the Madleen in international waters, detaining Thunberg and 11 other pro-Palestinian activists on board. The group included six French nationals, a French-Palestinian member of the European Parliament, and citizens from Brazil, Spain, and Turkey. The Israeli foreign ministry portrayed the voyage as a public relations stunt, sharing images of Thunberg in front of an Israeli flag and stating that the activists were undergoing medical examinations upon arrival at the Port of Ashdod.