Roger Joseph Mostyn (1840-1911) (1840–1911) Parents Sir Edward Mostyn, 7th Baronet Constantia Slaughter Children Roger Joseph Francis Mostyn Charles Aloysius Mostyn Siblings Edward Mostyn Agnes Mostyn William Mostyn Sir Pyers Mostyn, 8th Baronet Llewelyn Mostyn Winifred Mostyn Frances Mostyn Catherine Mostyn Teresa Mostyn Barbara Mostyn Mary Pauline Mostyn Partners Mary Perry