William Hampton married Margaret Jane Hampton on 12th December 1839. Their son Seth was born 27th August 1846 [doesn't appear to be any other surviving children]. Margaret Jane died in approximately 1849.
William remarried - marrying Mary Rountree on 10th October 1851. They had the following children:
Eliza Jane born 8th October 1852 and baptized 6th March 1853
Rebecca born 5th August 1854 and baptized 26th November 1854
William John born 12th February 1856 and baptized 15th March 1857
Caroline born 25th October 1858 and baptized 9th January 1859
Annabelle born 16th July 1861 and baptized September 1861, died in 1866 aged 5 years
Joseph born 3rd July 1863 and baptized 14th February 1864
Leonard born 11th March 1866 and baptized 30th April 1866, died in 1866 between 1 and 9 months old
Anne born in 1867 [no other details]
William died 28th January 1868. His Will mentions William John and Joseph by name and his daughters who he unfortunately doesn't name. He also leaves ?5 to his son Seth who he says now lives in Australia.
No further trace of Rebecca, Joseph or Anne so far [they don't appear to have stayed in Armagh but there is no evidence that they emigrated either]
One of the witnesses to William's second marriage was a David Hampton [possibly could be William's brother]. William's father was called 'Seth'.