 Her grandmother was the second daughter and eventually sole heiress of James Hamilton of Neilsbrook, County Antrim.Her great-grandfather was the son of Archibald Hamilton, the next brother of James Hamilton, 1st Viscount Claneboye.Her great-grandfather became the sole heir of Viscount Claneboye when the 1st Viscount's grandson, Henry Hamilton, 3rd Viscount Claneboye, Baron Hamilton, and 2nd Earl of Clanbrassil, died in 1675 with no sons.