Thomas was born at Henwoodie, but is not there for the census of 1841.

There is a Thomas Armstrong at Langshawburn aged 15, living with John (61) and Esther (58) Murray.  

Are these his maternal grandparents?

Considering that it is an 8km walk to Roberton from Henwoodie, the 11km walk from Langshawburn to Henwoodie would be easy for a visit home for Thomas.

In the 1851 census there is a Thomas Armstrong at Over Phawhope NT181081, working as a shepherd.  However this is probably not our Thomas, as he would be in Eskdalemuir at this time.

Thomas and Mary had six children in the standard family tree :-

Archibald 1856

Esther 1857

Francis 1859

Jane 1861

John 1863

Margaret 1866

In the census of 1861 Thomas and Mary live at Newlandhill and have the following children:

Isabella (9) and Mary (7) as well as Archibald (5), Esther (3) and Francis (1).

Are these two more children? - Need to look for records of birth certificates.

Newlandhill is at grid ref. NY255864

There is no house or farm here on modern maps, but it is here on the 1843-1882 map.

In 1871 they live at Keirhead, still in the Tundergarth parish, but I can't find this on either the new or old maps (is it Carhead?).

Here they have just the six children of the standard family tree, but Isabella and Mary could have left home by this age.

In the census of 1891 Thomas and Mary live at Lockerbie Road, Capelfoot, with their son Francis and his wife Isabella and their grandson son Archibald aged 6 months.

In addition to Thomas and Mary's daughter Esther, there are also two grand children Mary (10) and Thomas (7).  It is not immediately clear from the available information who the parents are.

There is a final census with Thomas and Mary in 1901, still living at Capelfoot, with three grandchildren Thomas (14), Archibald (5) and Isabella Nichol (Dairy Maid).  I don't yet know who's children Thomas and Archibald are, but Isabella Nichol would appear to be the daughter of Thomas and Mary's daughter Isabella.  Isabella married Robert Nicol (shepherd) and had 11 children.

In the 1881 census, Robert and Isabella live in Langshawburn Cottage, with children Elizabeth, Mary, Christina, and Agnes Murray Nicol (remember Thomas was at Langshwburn with the Marray family in 1841 - I don't know why the chose to remember the Murray connection for Agnes).

In the 1891 census, they are still at Langshawburn and have additional children Isabella (with Thomas and Mary in 1901), James, Jane, Margaret, Esther, Thomas and Robert.

In the 1901 census they have moved to Aberlask in Eskdalemuir and have more children

Another find from the box, Mum thinks this is a double Golden Wedding photo:

Margaret and Jane married William Bell and James McRobert in a double wedding on 12th Feb.1887.

So the 50th anniversary would be 1937.  Mum remembers staying with her grandmother Isabella while the party was on.

I guess it would be taken in Corrie Parish Hall.