There are numerous online trees on a/try which can be viewed with a subscription, such as here
http://person.ancestry.co.uk/tree/45781727/person/230050712713/factsThe famlily were already in Scotland by 1851:
David Marshall 28 Agr Servant b. Ireland
Margt Marshall 28 b. Ireland
Eliza Marshall 7 b. Ireland
James Marshall 6 b. Campsie, Stirlingshire
John Marshall 2 b. Campsie, Stirlingshire
David Marshall 6 Months b. Campsie, Stirlingshire
Willm Thomson 21 Brother-in-law b. Ireland
Address: Blue Row, Milton, Campsie Stirlingshire
There are details on this family tree of Elizabeth Marshall/Greir/Docherty's death in December 1919 from heart failure. Also included is the original marriage cert for Elizabeth to Daniel Greir in 1862 confirming her parents as David Marshall and Margaret Thomson.
Interestingly, from the many well documented trees, none of them seem to have been able to trace what happened to John born 1880 in Maryhill. Quite a lot of details, including death dates, have been included for his siblings but nothing for him...
Monica