Sydney Mostyn Peerage person ID=50913 (b. 1608) Parents Mary Wynn Roger Mostyn Children Mary Grosvenor John Grosvenor Robert Grosvenor Lettice Grosvenor Thomas Grosvenor Catherine Grosvenor Sidney Grosvenor Hugh Grosvenor Sir Richard Grosvenor, 2nd Baronet Siblings Roger Mostyn Robert Mostyn John Mostyn William Mostyn Catherine Mostyn Sir Thomas Mostyn Edward Mostyn Richard Mostyn Partners Sir Richard Grosvenor, 1st Baronet Sir Richard Grosvenor, 2nd Baronet