The book is called "A Manx Family - The Gells & Gills of Kenaa & Malew" by the late John Stowell Kenyon. It was sent out to all those who were included. It built on work previously done by Deemster Fred Gill and Cecil Hope Gill. There is probably a copy in the Manx Museum to which institution Stowell left his papers.

(I know the information because I was one of the recipients)