Thirteen-year-old Princess Yvonne Sayn-Wittgenstein-Sayn takes a swig from a bottle while her brother Prince Alexander, just twelve, sits with a half-smoked cigarette. Taken aboard the yacht of Bartholomé March off Majorca in 1955, the photographer was Marianne “Manni” Sayn-Wittgenstein-Sayn — the mother of Yvonne and Alexander — who’s known by her photographic soubriquet of “Mamarazza”.
Princess Manni was born in Salzburg in 1919, the daughter of Friedrich Baron Mayr-Melnhof and his wife Maria Anna Countess von Meran. The eldest of nine children, she received a camera from her parents in 1935 and began a lifelong love of photography. (source)