Looking at the Bristol Records Office Wills, they do hold the Will of : Mary HILHOUSE - 1827 (Mary his wife, is mentioned in James' Will)
A2a: The National Archives - hold other info on Hilhouse
Including:
Will of George HILHOUSE of Clifton, Bristol - dated 8 May 1848, which can be downloaded for £3.50 or is on Ancestry - mentioned his brother Abraham
Tree on Ancestry
George HILHOUSE, birth c 1788 - Death 24 December 1849, Clifton, Bristol
Residence: 1841, Westbury Upon Trym, Gloucestershire - aged 62, not born in County and a Merchant
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Bristol Records Office Wills
POOL
Robert POOL - 1850
Thomas POOL - 1825
Benjamin POOLE - 1854
John POOLE - 1829
Robert POOLE - 1855
William POOLE - 1826
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Family Search
children of Jas Martin HILHOUSE & Mary BUSH (also on Ancestry)
Martin Hilhouse - 8 October 1783, Clifton
Sarah - 27 March 1795
Marian - 24 August 1780
Geo. - 6 April 1778
Elionor - 27 March 1795 - Family tree on Ancestry **
Abraham - 25 June 1788
Caroline - 1781
Rbt - 25 June 1788
**Eleanor HilHOUSE married : Henry BUSH : 16 September 1824, Clifton, Bristol
Mother : Mary BUSH - died 1827, Combe House, Clifton, (so Will at the Bristol Records Office)