In 1865 the family, including another daughter born en route, settled at Seventeen Mile Rocks on the Mermaid Reach of the Brisbane River.
John, the eldest and unmarried son, resided at Beechwood with his mother until her death in 1904 aged 83 and his own demise ten years later.
James Jr married in December 1887, and the new house, named Glen Ross in reference to the family home in Ireland, was extended over time to accommodate six sons and three daughters.
[1] A fourth residence, Avondale, on portion 304 to the east of Beechwood, was erected in the 1890s for Benjamin Sinnamon, the ninth child, who purchased the property in 1886 from other family members.
[1] George, the third of James and Margaret Sinnamon's children, purchased Rosemount, a sixteen-acre property on the opposite side of Seventeen Mile Rocks Road, where an avenue of mango trees remains (portion 313).
By 1876 local residents had collected sufficient funds to erect a new school facing Goggs Road on the southeast corner of portion 316, about 100 metres (330 ft) south of the original site.
This building was completed in 1877 by Wilson Henry, local resident and cousin to the Sinnamon family, and opened at the beginning of the 1878 school year with 32 pupils.
In the early 1900s the interior of the schoolhouse was lined with narrow tongue and groove boards and its shingled roof was replaced with corrugated galvanised iron.
[1] Despite Hercules Sinnamon's commitment to retaining the area as farmland, after his death, the land was sold for development of residential housing estates.
In 2011 a masterplan was created to redevelop the heritage-listed buildings Glen Ross, Beechwood and the former Seventeen Mile Rocks School as residences with work underway in 2014.
This includes the following:[1] This farm house comprises four bedrooms and a parlour, and is a typical timber dwelling of the Separation period, although the detached kitchen and stables no longer exist.
This includes internal cedar joinery, and hardwood log bearers which run the width of the house on stumps, their ends protruding beyond the walls.
Beneath its short-ridge roof of corrugated galvanised iron and rear extension are twelve rooms, a number of which have been created by enclosing parts of the encircling verandahs.
The exposed stud frame of the main house, which is lined on the inside with vertical tongue and groove boards, is accentuated by a large cross brace on either side of each four-paned sash window.
To the west a group of outbuildings provides shelter for various vehicles and implements, including the early Sinnamon family plough of bush timber and iron share.
[1] Glen Ross is an intact, cohesive and maintained farm house which retains its original character and has been extended sympathetically over time to accommodate a family on the land.
Its exposed stud frame, which is lined on the inside with vertical tongue and groove boards, is accentuated by a large cross brace on either side of each four-paned sash window.
Avondale has fewer main rooms than Glen Ross, and the walls of four inch vertically jointed boards and the rear projection indicate a later construction period.
The buildings, structures, sites, objects, and plantings of Sinnamon Farm form a rare rural grouping within a late 20th century suburban district in Brisbane, and are important in illustrating a past way of life.