Did you get to solve this? I have some information on this family and can put you in touch with a family member. Matilda Merchant's father died and her mother married Walter Doig. Matilda married William R Matchtt in 1858 in Sydney. their children were Robert b.1881-1941 m.Francis S Ongley and Margaret Ongley; Richard b.1882-1943 m. Ida M Molloy; ThomasHenry b.1886 or 1884-1943 m. Mary I Green; May E b.1887-1889; Mary J b.1886-1886; William d.1917.
William die in 1888 aged 30yrs.
Matilda married Patrick Brandon and had Henry, Charles, George, Linda.