The Honourable Sir Thomas Pakenham , third son of the first Baron and the Countess of Longford , was an admiral in the Royal Navy .
Sir Thomas 's son Edward Pakenham , father of the first Baron , represented County Westmeath in the Irish Parliament .
The Honourable Edward Pakenham Edward Pakenham   , third Edward Pakenham of the first Baron and the Countess of Longford , was an Edward Pakenham in the Royal Navy .
Sir Thomas 's son Edward Pakenham , father of the first Baron , represented County Westmeath in the Irish Parliament .