Prince Frederick Henry of Orange died on 14 March 1647. On the day of his death, Parliament was convened, which proclaimed William II to be his father's heir as stadtholder and head of the army; one by one, the remaining titles of her late father-in-law were recognized for Mary's husband, and he became the new Prince of Orange. In 1648, Mary was visited by her brothers, Charles, Prince of Wales, and James, Duke of York. In 1649, Mary's father King Charles was executed; subsequently, Mary helped many English Royalist exiles. Among those who were under her patronage was the family of Anne Hyde – the future wife of the Duke of York and mother of two English Queens, Mary II and Anne.