Eva Wetlesen was born to Edgar Wetlesen and Ragni Wetlesen (née Frisell; later Henning). Henning is a step-daughter to the Swedish stage actor Uno Henning.
Eva Wetlesen was born to Edgar Wetlesen and Ragni Frisell, who later married Henning, making him her stepfather. Additionally, Henning is the stepdaughter of Swedish stage actor Uno Henning.