Hi there Sue,
Not to sure where you have found your info.

Alexander Vicars married Grace Armstrong 2/9/1887 Lanark
Alexanders parents Robert Vicars and Mary Hatchkers ?
Grace's parents John Armstrong and Grace Murray formerly Armstrong nee Mclachlan
If you want to PM me with your email address will forward marriage from SP.
It seems
John Armstrong died 1871 New Kilpatrick Dumbartonshire
Grace remarried James Murray 1872 New Kilpatrick Dumbartonshire
You would need to check these out on SP
1891New Kilpatrick; ED: 9; Page: 16
Knightswood No 109 New Kilpatrick Dumbartonshire
Alexander Vicars 1865 Jordanhill, Lanarkshire Ironstone miner
Grace Vicars 1869 Cloberhill, Dumbartonshire
Robert Vicars 1888 Netherton, Dumbartonshire
Grace Vicars 1890 Holms, Linlithgowshire
1881 Cloberhill House New Kilpatrick Dumbartonshire
New Kilpatrick; ED: 8; Page: 21
James Murray 1837 Paisley, Renfrewshire signalman
Grace Murray 1836 New Kilpatrick, Dumbartonshire
Elizabeth Armstrong 1861 do PaperMill
John Armstrong 1864 do Ironminer
Maggie Armstrong 1866 do Cotton factory worker
Grace Armstrong 1868 New Kilpatrick, Dumbartonshire
Christina Murray 1873 do
1861 Cowden Hill House New Kilpatrick Dumbartonshire
New Kilpatrick; ED: 9; Page: 15
John Armstrong 1820 Partick, Lanarkshire miner Head
Grace Armstrong 1835 New Kilpatrick, Dumbartonshire
James Armstrong1857 do
Mary Armstrong 1859 do
Eliza Armstrong 1861 do
Agnes MacLachlan 1835 do Mill worker sister-in-law
Jane MacLachlan 1839 do scholar do
Regards
Mariac