« Reply #1 on: Monday 07 April 25 16:22 BST (UK) »
There is a baptism of a Michael Shasby with those parents on 2 November 1821 in St. Canice's, Kilkenny, address of father given as Black Mills. It's very dark and difficult to read, but you can see it here:
https://registers.nli.ie/registers/vtls000635359#page/1/mode/1upOther children to the same couple Patrick 19 Mar 1815; Thomas 12 Jan 1817; George 27 Mar 1819;
Mary 02 Aug 1824; Ellen 02 Dec 1827. There may have been others.
Also John and Margaret's marriage on 06 Feb 1814.
All the above records can be seen on registers.nli.ie
Coffey, Cummins [Rathfalla, Tipperary], Cummins [Skirke, Laois], Curran, Dillon [Clare], Fogarty [Garran, Laois/Tipp], Hughes, Keshan (Keeshan), Loughman [Harristown and Killadooley, Laois], Mallon [Armagh], Malone, Markham [Caherkine, Clare], McKeon(e) [Sligo/Kilkenny/Waterford], McNamara, Meagher, Prescott [Kilkenny/Waterford/Wexford?], Rafferty, Ryan, Sullivan, Tobin
GEDMatch: T665306 tested with Family Tree DNA and also with ancestry
GEDCOM file: 1980344