The Brig Lily was Dec 1852 so guess it was grandson (even Manx 70 year olds were unlikely to be clambering about the wreckage at night with candles (the stub of which ignited the gunpowder in the morning when the official salvage crew arrived blasting most of them beyond recognition - including one William Cowley aged 42)!
see http://www.ee.surrey.ac.uk/Contrib/manx/famhist/genealgy/disaster.htm
(the univ web server is likely to be off line during weekend 17/20 Dec for major computer room rewiring)