Family traditions have a habit of being only partly true.
But to add to the questions in regards to L. S. Lowry my grandfather was Samuel James Heylands Lowry born near Ballymagorry in County Tyrone in 1890. It has always been said that our family is related to the family of L.S Lowry My uncle has mentioned that my Great Grandmother Sarah was in contact with the family in the Nineteenth century.
This is a subjective comment but the images I have seen of L.S. Lowry bear this out insofar as there seems to be a family resemblance between my grandfather and L.S. Lowry.