This is an etching made by David Fitzpatrick based on a photograph that shows the Russell Brothers together at home in Doolin. Etching is an intaglio printmaking process in which lines or areas are incised using acid into a metal plate in order to hold the ink.
You can view the original photograph here
Sincere thanks to David Fitzpatrick for sharing his etching and the original photo with The Russells of Doolin Project.