Marriage and children
About 1615 William Parsons married his cousin Elizabeth, eldest daughter of John Lany, an Alderman of Dublin, and niece of his maternal uncle Sir Geoffrey Fenton. This marriage made him a cousin of Richard Boyle, 1st Earl of Cork, the dominant Anglo-Irish magnate of his time, to whom he was close.
William and Elizabeth had five sons:
Richard (living 1639), MP for the borough of Wicklow, married Lettice Loftus, eldest daughter of Sir Adam Loftus of Rathfarnham, vice-treasurer of the Exchequer, and predeceased his father
John, married Elizabeth, daughter of Sir Walsingham Cooke, of Tomduffe, County Wexford
Francis (died 1668) of Garrydice, County Leitrim, married Sarah Faircloath, and left children
James, died unmarried and
William, died unmarried
—and seven daughters:
Catherine, married Sir James Barry, created 1st Baron Barry of Santry
Margaret, married Thomas Stockdale of Bilton Park, Yorkshire
Elizabeth, married Sir William Ussher, of Grange Castle, County Wicklow, grandson of Sir William Ussher, clerk of the Privy Council of Ireland
Jane, married Sir John Hoey, Knight of Dunganstown, County Wicklow
Mary, married Arthur Hill of Hillsborough, County Down
Anne, married Sir Paul Davys, Secretary of State (Ireland)
Judith, married Thomas Whyte of Redhills, County Cavan