[1] Robert Porter married Sarah Martha Elizabeth Trowbridge (born about 1823–1824 in Salisbury, England).

They had the following eight children:[1][2][3][4] Robert Porter died at his home, Corio, Wharf Street, Kangaroo Point, Brisbane on 22 May 1902 aged about 76 or 77 years.

[3] Robert Porter was a contractor, mostly in bridge and wharf construction in both the northern and southern parts of Queensland.

[12] Robert Porter was a Member of Board of Waterworks 1893–1901, resigning only due to his failing health (he died in 1902).

[2][9] Robert Porter was a Government representative on the Brisbane Fire Brigade Board for many years.