Lansbury was born to an upper middle class family on October 16, 1925. Although her birthplace has often been given as Poplar, East London, she has rejected this, asserting that while she had ancestral connections to Poplar, she was born in Regent's Park, Central London. Her mother was Belfast-born actress Moyna Macgill (born Charlotte Lillian McIldowie), who regularly appeared on stage in the West End and who had also starred in several films. Her father was the wealthy English timber merchant and politician Edgar Lansbury, a member of the Communist Party of Great Britain and former mayor of the Metropolitan Borough of Poplar. Her paternal grandfather was the Labour Party leader and anti-war activist George Lansbury, a man whom she felt "awed" by and considered "a giant in my youth." Angela had an older half sister, Isolde, who was the daughter of Moyna's previous marriage to writer and director Reginald Denham. In January 1930, when Angela was four, her mother gave birth to twin boys, Bruce and Edgar, leading the Lansburys to move from their Poplar flat to a house in Mill Hill, North London; on weekends they would vacate to a rural farm in Berrick Salome, near Wallingford, Oxfordshire.