I have also found a brother for John McMaster/s (1808-1861).
George McMaster (1813-1882) married Jane Simpson in Walton on the Hill Parish Church, Liverpool in 1846. They lived most of their lives in Upper Stanhope Street Liverpool. He was a Stevadore and Master Stevadore. They produced 2 children Andrew (1855-1940) & Mary (1857-?). Andrew (1855-1940)also a Master Stevadore, was father of Anew McMaster (1891-1962) the famous actor manager.
Phew - sorry about the length of that lot!
Isn't family history research the best 'who done it' !