Hi David
Not a great deal I'm afraid. They are not included in the 1901 census - my automatic reaction to that is "if not in UK, where might they be?" and South Africa seems a logical answer (there are others obviously,but South Africa is the one that springs to mind) Arthur and Stephen Wingate Pearse are the sons of an English rector; Augustus and Henry are the sons of an Indian Army officer. Colin was also the son of an Army officer, born in India - most of that side the family seem to have the military in their blood.
Anne