Further evidence that the daughter of John Henderson and Marion McKendrick was not the Martha Henderson who married Peter Rutherford.
ColC has already posted part of the 1841 census in the village of Kirkconnel.
John Henderson, coal m(iner), 70
Marion Henderson, 64
Martha Henderson, 25
Margaret Henderson, 21
John Stevenson, 3
William Stevenson, 1
all born in Dumfries-shire
Loobylooayr found the marriage of Martha Henderson and Thomas Stevenson in Kirkconnel on 18 October 1839.
There is a baptism of William Stevenson, son of Thomas Stevenson and Martha Henderson, in Kirkconnel on 12 April 1840. John would have been born before Martha and Thomas were married, which would account for the absence of a baptism record.
And Martha and William are still there in 1851
Martha Henderson, widow, 35, born Kirkconnel
William Stevenson, son, 11, born Kirkconnel
Note that it is perfectly normal to find widows, and indeed married women, listed by their maiden surnames in the early census. It does not imply that they are unmarried.
By 1861 they have moved to Muirkirk, Ayrshire
Martha Stevenson, widow, 46, born Kirkconnel
William Stevenson, son, 21, born Kirkconnel
John Henderson Stevenson, son, 10, born Kirkconnel
There is a birth record in Kirkconnel of John Henderson, illegitimate son of Charles McLoud, railway labourer, and Martha Henderson, on 16 April 1851.
In Muirkirk in 1871
Martha Stevenson, widow, 54, born Kirkconnel
John Stevenson, son, 20, born Kirkconnel
Can't find any of them after that - they may have emigrated. But unless there were two John Hendersons, married to two Marions, both of whom had a daughter Martha in Kirkconnel in 1814/1816, this Martha must be the daughter of John Henderson and Marion McKenderick of Kirkconnel.