Who were they?

The following are the family I am trying to trace back for any details of Irish/USA records of the parents other than the marriage record.

Jeremiah MacGillicuddy(McGill) of Garahadoo
m. Sarah Leslie (Lestu) 15 Feb 1825 Killorglin, Kerry Ireland
Witness 1 ELIZABETH DE COURCY Witness 2 THOMAS GREADY

1. Mary McGillicuddy b . ba 5 Jun 1825 Garrahadoo (Garrihidoo), Killorglin, Kerry, Ireland
2. Cornelius McGillicuddy b . ba 24 Oct 1826 Killorglin, Killorglin, Kerry, Ireland
3. John MacGill(icuddy) b&. baptised 17 Aug 1828 (www.irishgenealogy.ie) became a Jesuit priest. Professor of Rhetoric, St Louis 1864 – 65, 1868-76 Administrator and Vicar General of Covington, returned to Jesuits and died Detroit 1880.
4. Florence McGillicuddy, b . bap 1 Jan 1830, Killorglin, Killorglin, Kerry, Ireland
5. James Herbert McGill[icuddy] born 17.7.1831, Killorglin, Killorglin, Kerry, Ireland (family and www.irishgenealogy.ie)
6. Charles McGILLICUDDY, b. bap 2 Sep 1832, Killorglin, Killorglin, Kerry, Ireland
Shoemaker of Chelsea MA
m. Mary Galvin 18 of Chelsea, 28 Dec 1851
7. Alexander McGillicuddy b. 24 Feb 1834 Killorglin, Killorglin, Kerry, Ireland
Boot and shoemaker of Charlestown MA
m. Mary Condon 21 of Charlestown 26 Aug 1855
8. Ellen McGillicuddy b. 20 Sep 1835 bapt. 20 Oct 1835 Milltown, Kerry, Ireland
9. Anne McGillicuddy b. 8 Jun 1837 bapt. 6 Aug 1837 Killarney, Kerry, Ireland
10. Catherine Mcgillicuddy b bap 30 Jan 1839 Killorglin, Killorglin, Kerry, Ireland
11. Dennis McGill d. 05 Jun 1883. Natwick, Middlesex, Massachusets. Est. b. 1845. (https://familysearch.org/pal:/MM9.1.1/N7L2-4QQ)

All the above children are listed with parents Jeremiah McGillicuddy and Sarah Leslie.
I have the tree down from James and the families of many of the boys which I would be happy to share. I am not family myself but have an interest (my wife would call it an obsession) to identify the son James and his path from Kerry to California and then Australia where he was involved in the Eureka Stockade incident.

My main questions relate to the parents Jeremiah and Sarah - Who were they?

I am aware that there were many of the same name around the same time, however the "Chute family" listing on Rootsweb mentions many names current in the tree I have. For example, the name "Herbert" was preserved not only with James, but his brother Cornelius has a GGGgranddaughter named "Paula Herbert McGill" with a sister "Sarah Leslie McGill". Family tradition has James as somehow related to the McGillicuddy of the Reeks, and refer to Sarah as "Lady Sarah" which might suggest a connection to Leslie House in Kerry. I estimate that both were born circa 1800 and so far have no birth record close enough. I have considered the Cornelius born 1762 of Cornelius Connor McG and Catherine Chute. However I haven't found any record yet of spouse or children. I also have not identified Sarah but note that she was pregnant when married so possibly they went to another district for the wedding. The witnesses include a De Courcey, another significant name of the time. Many of the family went to USA c1849 but I have not found a record of their passage and there is a possibility that they did not all go at once. One family story has Jeremiah owning land in the area around Boston, and travelling back and forth before the permanent move, but I cannot confirm.

The Leslies of Kerry are often recorded but the girls do not get much of a mention if any. The following: Baptism of FRANCES LESLIE of LESLIE LODGE on 28 November 1798 is the closest match for Sarah Leslie if, like her mother she used her second name in daily life and it happened to be Sarah! How can I find out?
I am at a brick wall and looking for a way to proceed but as much as possible without much expense. I would appreciate any advice.

Thanks,

Dennis Wright

wrightdfarnham@bigpond.com