152–153 The ceremony—which was not attended by her eldest sister and brother-in-law , the Crown Prince and Princess of Prussia , who were detained in Germany ; William Ewart Gladstone ; or Beatrice 's cousin , Princess Mary Adelaide , Duchess of TeckThe duchess was in mourning for her father-in-lawDennison , p. 153—ended with the couple 's departure for their honeymoon at Quarr Abbey House , a few miles from Osborne .
Princess Beatrice of the United Kingdom 's cousin William had Ewart as a middle name .