Her father was a politician in Ireland for most of his life .
She was the daughter of William Ponsonby , 2nd Earl of Bessborough and Lady Caroline Cavendish , the eldest of his three children .
daughter 's father was a politician in Ireland for most of his life .
She was the daughter of William Ponsonby , 2nd Earl of Bessborough and Lady Caroline Cavendish , the eldest of his three children .