Arabella Mainwaring Ellerker (1755-1782) (1755–1782) Parents Eaton Ellerker Barbara Dixon Children Lady Harriet Onslow Arthur Onslow, 3rd Earl of Onslow Edward Mainwaring Mainwaring-Ellerker-Onslow Thomas Cranley Onslow Siblings Roger Ellerker Harriet Mainwaring Ellerker Elizabeth Ellerker Abraham Ellerker Charlotte Ellerker Alice Ellerker Partners Thomas Onslow, 2nd Earl of Onslow