Hi Sammy
Here are some of Elisha's siblings taken from this website :
https://www.familysearch.org/search/records/index#count=20&query=%2Bfather_givenname%3AThomas~%20%2Bfather_surname%3AFisher~%20%2Bmother_givenname%3AMary~%20%2Bmother_surname%3ABeattie~&collection_id=1584963name: Benjamin Fisher
gender: Male
birth date: 22 Jul 1865
birthplace: KILMOOD,DOWN,IRELAND
father's name: Thomas Fisher
mother's name: Mary Beatty
name: Thomas Fisher
gender: Male
birth date: 24 Jan 1869
birthplace: Down, Ireland
father's name: Thomas Fisher
mother's name: Mary Beattie
name: Robert James Fisher
gender: Male
baptism/christening place: COMBER, DOWN, IRE
birth date: 28 Jul 1872
birthplace: Comber, Down, Ire
father's name: Thomas Fisher
mother's name: Mary Beattie
name: Mary Fisher
gender: Female
baptism/christening place: COMBER, DOWN, IRE
birth date: 27 May 1874
birthplace: Comber, Down, Ire
father's name: Thomas Fisher
mother's name: Mary Beattie
name: John Nelson Fisher
gender: Male
birth date: 14 Feb 1877
birthplace: Down, Ireland
father's name: Thomas Fisher
father's birthplace: Cornber
mother's name: Mary Fisher Beattie
name: Agnes Fisher
gender: Female
birth date: 06 Jun 1879
birthplace: Comber, Down, Ireland
father's name: Thomas Fisher
mother's name: Mary Beattie Fisher
This website only goes as far as 1880, so unfortunately Elisha is not on it.