Samuel Richard Calkin is my grandfather's half-brother. Their father was Samuel Calkin, born in the UK, who emigrated to the US in the 1850s, settling in New Jersey. It would appear that he left behind his son, Samuel Richard, and a wife, and remarried once he settled in the US. During the course of my genealogy research, I was contacted by Maureen Calkin, of Whangarei, whose husband is apparently a descendant of Samuel Richard Calkin. I believe she has more information on him. If you like, I can provide Maureen with your email address and she can contact you directly.