I too have ancestors - Shanks From Poyntzpass, Co Down, N Ireland.
Samuel and Margaret Shanks (or Cruikshanks) from Poyntzpass according to their daughter's wedding and death certificates. Samuel was a farmer.
6 sisters Eliza (b1829), Mary (b1831), Martha (b1833), Agnes (b 1835), Sarah (b1843) and Rebecca (b1850)came out to Australia on different ships between 1853 and 1869, where they all married.
One sister Margaret (b1848) married in Lisnabrague and then migrated to USA with her first husband David B Irwin in 1868. He died shortly after and she then married James Craig in Hanover, Jo Daviess Co. Illinois.
A brother George (b 1836) married Eliza Allen on 10 Jun 1868 in Ballymore, Armagh. I think they lived in Ireland but he died in Pennsylvania USA.
There may have been another son Samuel
I visited Poyntzpass and the surrounding areas in 2015 and met with Kathryn Stewart (nee Shanks) at her mother's home (Mrs Shanks) at Lisnabrague, just out of Poyntzpass. Her father was deceased at this time. Unfortunately, we were unable to make the connection between our Shanks families.
I took photos of graves at Fourtowns Church and the Poyntzpass Presbyterian Church. The latter had a grave inscription to "Samuel Shanks died 04 July 1873 age 87 and wife Margaret Shanks died 10 Aug 1883 age 77 and grandsons George died 17 Apr age 2 and Samuel James died 09 Aug age 35". I cannot verify they are mine, as yet.
Does this match any of your information ? I would love to sort all of the families out for once and for all Please let me know what you think? Isabel