Princess Margaret, Hereditary Grand Duchess of Hesse and by Rhine Hessian Royal (1913-1997) (1913–1997) Parents Isabella Gamble Ross Auckland Geddes, 1st Baron Geddes Children Princess Johanna of Hesse and by Rhine Siblings David Campbell Geddes John Reay Campbell Geddes Ross Campbell Geddes, 2nd Baron Geddes Alexander Campbell Geddes Partners Louis, Prince of Hesse and by Rhine