Okay, see where you are with this now...could well be the right William
Also, note the reference to Haileyburg for William's usual residence when he died in 1911.
As Anne has mentioned, looks like parents were Alexander Robertson and Mary Low. Only 3 sons showing for them:
Alexander b. 1864
www.familysearch.org/ark:/61903/1:1:FQRC-S4CWilliam b. 1865
www.familysearch.org/ark:/61903/1:1:FQR8-42XDavid b. 1867
www.familysearch.org/ark:/61903/1:1:F79D-LM6All births in Glasgow. I think Alexander Snr was deceased by 1871. Likely census for family:
Mary Robertson 31 b Kincardineshire, Fourdon
Alexander Robertson 7 b. Glasgow
William Robertson 5 b. Glasgow
David Robertson 4 b. Glasgow
Address: Inverury St, Fourdoun Kincardineshire
1881 and the family living in Dundee:
Mary Robertson 41 laundress b Kincardineshire, Fourdon
Alex Robertson 17 App Engine Fitter b. Glasgow
William Robertson 15 Labourer Shipyard b. Glasgow
David Robertson 10 b. Glasgow
So we have the reference to Dundee there
Mother Mary Low Robertson died 21 Feb 1911 in Dundee, just some months before son William. Son Alexander Robertson, marine engineer residing at 78 Watson Street was executor. There are two documents for Mary on Scotlands People, one of them marked up as her will. Her will was dated 1905 so wonder if it made reference to son Willilam as he did not die till October 1911.
Monica