(Birth date earliest guess based on father's)
Married 'Isla'
Marriage Index Groom Given Name(s): John Scott Groom Last Name: ROBERTSON Bride Given Name(s): Isla Kathleen Bride Last Name: SWANN Marriage Date: 1920, November 20 Marriage Place: Methodist Church Malvern Groom Age: 32 Groom Approx. Birth Year: 1888 Groom Marital Status: S Groom Father: William ROBERTSON Bride Age: 27 Bride Approx. Birth Year: 1893 Bride Marital Status: S Bride Father Name: John Peter SWANN District: Adelaide Symbol: Book/Page: 285/676
Given Name(s): John Scott Last Name: ROBERTSON Death Date: 03 Jul 1955 Gender: M Age: 68y Approx. Birth Year: 1887 Marital Status: M Relative 1: Relative 2: Residence: Plympton North Death Place: Northfield District: Port Adelaide Symbol: H Book/Page: 829/4019
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John is 27 degrees from Emeril Lagasse, 23 degrees from Nigella Lawson, 19 degrees from Maggie Beer, 42 degrees from Mary Hunnings, 26 degrees from Joop Braakhekke, 31 degrees from Michael Chow, 28 degrees from Ree Drummond, 22 degrees from Paul Hollywood, 25 degrees from Matty Matheson, 31 degrees from Martha Stewart, 37 degrees from Danny Trejo and 33 degrees from Molly Yeh on our single family tree. Login to find your connection.
Those dates must have been entered before John's approximate birth date was known (when it was assumed that his father died in 1886, not that he was married then).
I'll edit his children to reflect his marriage date.
The profiles of John's profiles show they were born before he was.
John's details look correct, so the issue is probably with his children's dates.
Cheers