Yes he did. Ther is two possibilities depending on what years you are looking at:
1) Ann Christina Hoy (Newlands) was his Aunt and was the second child of William Newlands & Catherine Golden.
2) Anne Christina Price (Hoy)B:1879 D:1932 who was the fith child of George & Ann Hoy and was a cousin to Robert George Newlands.
I would think you are looking at Anne Christina Price as Robert George did not move to Stanthorpe area until 1916 and one of his younger brother Edgar Sydney moved to same area in 1920 after returning from WW1. As far as I am aware these were the first Newlands' in the area.
In the years immediately after he married he worked in central Qld and electoral rolls show at least Charlotte was living it Chaters Towers in 1908.
William Newlands & Catherine Golden had five children:
John Newlands - B: 17-11-1843 Sydney D: 27-07-1917 Goondiwindi
Ann Christina Newlands - B: 14-01-1846 Sydney D: 16-05-1892 Charters Towers
Margaret Lochart Newlands - B: 15-01-1848 Sydney D: 26-12-1942 Tenterfield
William Bernard Newlands - B: 06-02-1850 Sydney D: 01-03-1923 Tully (I haven't been able to cofirm he died at Tully but believe this is correct)
Robert Bruce Newlands - B: 25-05-1852 Sydney D: 12-04-1936 Goondiwindi ) Again i haven't confirmed but believe is correct.)
Ann Christina married George Fredrick Hood 16-07-1867 in Sydney. George Fredrick Hood however was not his real name which was actually George Hoy. There is a story behind the use of the alias from what I can gather. By 1870 they had moved to Toowoomba and were still using the name Hood at that stage. There first child named Lily was born in Toowoomba 19-01-1870 and died 10 weeks later 01-04-1870. This was the only child burn with the surname Hood all other 8 children were born with the surname Hoy. George Hoy was a baker and had a shop in Ruthven St Toowoomba until he became insolvent in Jan 1878. After that he moved to Charters Towers although he may have moved to Croydon first although I haven't been able to confirm.
As far as Ann Christina living in Stanthorpe I am not sure but it is possible that may have helped establish the orchard by assisting in clearing the land. As I understand it several family members assisted with the clearing. I have a photo which a family member has titled "Cottonvale Scrub Roll" which shows a pile of cleared trees that needed a ladder to get to the top of and has at least 8 people standing on top of it.
Hope this has helped.