You mentioned early in this thread Sarah Frances Gilbert. She is the daughter of John Gilbert (I don't have record of his father at this time) and Sarah Douglas of Lurgan. Married John Earls Rutherford and they moved to New York.
She had the following siblings, that I have been able to trace:
Anne Gilbert1835 – 1925 (Married William Wentworth Paul)
❏
♀
Mary Gilbert1841 – 1924 (married George Douglas)
❏
♂
George Gilbert (I believe he was George Douglas Gilbert named for his grandfather George Douglas: a George Douglas Gilbert born sometime in the 1840's. His father is unknown, and he marries Helena Harpur who was born 1850 in Newry, Down (she was christened at Newry Methodist 7 March 1850) They have the following children: 1. George Douglas Gilbert Birth 10 Dec 1871 in Ireland Death 21 May 1941 in New Westminister, BC 2. Perceval Gilbert Birth 07 Feb 1879 in Belfast, Antrim, Ireland Death 25 Jan 1947 in Haney, Maple Ridge, British Columbia 3. Jannetta Gilbert Birth 29 Mar 1880 in Belfast, Antrim, Ireland Death )
❏
♂
John Gilbert – 1877 (Married Anna Elizabeth Cordukes, and has a son named George Douglas Gilbert)
❏
♂
Simpson Gilbert – 1922 (Unmarried)