In the 1901 Scotland census, Registration District of Cadder Eastern District, address 5 Brown Land there is a Janet Clarkson age 54 bc 1847 and a son David Clarkson age 31yrs, Iron Work Labourer
(ED 3 Sch 179 Line 14) which seem to fit age and date wise.
Janet's parents; David Loudon died 9 June 1895 and Mary Loudon died 20 November 1897. Both of 410 St Georges Road, Glasgow. Probate granted to daughter Annie Loudon or Wood.
Checked the CLIP Index [Crew List Index Project] and found nothing there.
Spent a good portion of the day searching and still no closer to finding Robert.
TPB