I have a copy of the book. Chapter 16 pg 47...
" In the year 1813 Colonel James married Mary Napier Hodgins, daughter of John and Jane (Napier) Hodgins of Ballymackey, Ireland. Mary was four years younger than her husband. They raised eight children: John J.P., Jane, Mary Ann, Adam, Elizabeth, James, William Napier and Thomas"
Pg 50: " Thomas was the youngest son of Colonel James and Mary. He was known as Big Tom. He never married. He was born October 18 1831 and died 1892. He is buried in St James Cemetery, Clandeboye, beside his brother Adam"
Hope this helps.
Ken