My grandfather was John Small Rutherford son of Thomas Rutherford and Marie Donkin.
Thomas was the son ofHelena Hepple (25/3/? - 1910?). Father's name is not known but there was a marriage registered in Bishopwearmouth church on 23/8/1865 between David Rutherford and Helena Hepple which would fit.
Helena Hepple was allegedly the daughter of William Hepple and a Lennox. William's father was also allegedly called William.
There was definitely a link (if not a marriage) between the Rutherfords and Smalls, hence my grandfather's middle name. I have not been able to ascertain what the relationship was.