Got curious and looked at the marriage

It is Alexander the father, marine engineer, who married. He shows as widower, parents James Barron, occupation coach xxxx?, deceased and mother, looks like a remarriage, Mary Melrose, formerly Barron, maiden name McDonald .
Just to place him with family, this looks like him in 1861 (as transcribed):
James Barron 37, Coach Driver, b. Alva, Moraysh
Mary Barron 34, b. Dores, Invernesssh
Jessie Barron 14, b. Dores, Invernesssh
Alexr Barron 9, b. Edinkillie, Moraysh
James Barron 6, Knockando, Moraysh
William Barron 4, Rothes, Moraysh
Address:Two Sco Left By Onisbathe, Cromdale, Inverallan and Advie, Inverness
Janet is not the one born in Grangemouth (thank goodness!) but as you said, aged 36, spinster and domestic servant. Parents show as James Low, blacksmith (deceased) and Jane Rae. Her birth shows on IGI as:
JANET LOW Birth:17 MAR 1867
Bothkennar, Stirling
Parents:AMES LOW and JANE RAE
In the 1871 she looks to be with grandparents (as transcribed):
Peter K(?R)ae 64, iron weigher, b. Bothkennar, Stirlingshire
Janet B Rae 62, b. Cama Wath (?Carnwath), Lanarkshire
Peter Rae 19, b. Larbert Stirlingshire
Janet Low 4, granddaughter b. Bothkennar, Stirlingshire
Address: Fort Row, Larbert Stirlingshire
And her parents in Govan:
James Low 31, blacksmith, b. Labourn, Stirlingshire
Jane Low 30 b. Labourn, Stirlingshire
Agnes Low 2 b. Falkirk, Stirlingshire
Address: 104 Henderson St, Govan Lanarkshire
Monica
