"Charles Paul Russell of Motherwell scotland, UK"

I am researching my family history like most searchers though I have hit a brick wall anyone else researching this family able to shed light on the irish connection who lived in letterkenny donegal.. my grandfather samuel russell...grandmother catherine mulraney who married in uddingston lanarkshire on 30 dec 1910.
they lived on a farm called ballymacool can any one help?

many thanks