What we know so Far

Robert and Ann's Children
So far we know that:
Maria married Thomas Nelson King at the age of seventeen. Maria already had a child William Henry (Saunders) before they married in December 1854. It is unclear if William Henry was Thomas's child. Thomas died in 1858. Maria possibly married again to John Robotham in 1870 but it is hard to confirm if this is correct. Maria would have been John Robotham's third wife they had 5 children. 

Ann married Michael Keirnan, Kernan, Kearman at the age of fifteen he was 52 years old at the time. They had 8 children together before he passed away in 1891. It appears they lived in Evandale for the majority of their lives together.

Robert married Charlotte Cox who already had children to previous relationships it is unsure how many she had but one of her children David William Cox was supposedly brought up by his grandparents after Charlottes death.
Robert and Charlotte had a total of 10 children together. All but two girls Eliza and Charlotte died within the first year of life. Charlotte died in 1875 of peritonitis.
Robert married again to Catherine Kincade and they soon moved from Evandale to Fingal. They had a total of 11 children together. Robert died in Mathinna in 1926 Catherine 1930.

Elizabeth married William Roe Reynolds in 1856 at the age of 14. William and Elizabeth had 10 children and lived most of their lives in Deloraine.  Elizabeth Died in 1909 in Deloraine.

Ellen married Robert Massey in 1860 at the age of 16 he was 56 years old. They did not appear to produce any children together and he died in 1874. Ellen married Richard Whitehead in 1876 they had 5 children together and Ellen died in 1884 at just 50 years old. Ellen appeared to live in Evandale most of her life.

Sarah died in 1859 at 13 years old.

Jane possibly married John Johnstone Matthewson in Deloraine in 1873. They had 8 children together and lived in Ringarooma from about 1878. Jane died in 1930 in Ringarooma.

George so far have been unable to find any information on George other than his birth.

Male born 1852
Male born 1853
Francis born 1854
All died at birth or soon after.

Henry (Annie) James died in 1878.

It was mentioned in the Newspaper article written at Robert's death that seven of his children survive him. Also that he has thirteen children. I am desperately seeking anyone who might know who this child is. I am so far yet to find them. Possible Frederick or Thomas another thought is that Maria's child William Henry that she gave birth to before her marriage to Thomas King was considered their child.