His second son Sir William Pakenham was an admiral in the Royal Navy .
The Honourable Thomas Alexander Pakenham ( 1820 -- 1889 ) , third son of the second Earl , was a rear - admiral in the Royal Navy .
Thomas Alexander Pakenham 's second son Sir William Pakenham was an admiral in Royal Navy   Navy .
The Honourable Thomas Alexander Pakenham ( 1820 -- 1889 ) , third son of the second Earl , was a rear - admiral in the Royal Navy .