Hello Jackie,
I'm not related, and I'm not sure if you have the baptism record for Mary Keating, but I first uncovered her baptism transcription at the Find My Past (FMP) website. Linked to the FMP transcription is a copy of the original Cashel and Emly, Tipperary baptism record for her, held by National Library of Ireland, which shows she was baptized on 2 October 1798. Her baptism record can be found at: https://registers.nli.ie//registers/vtls000632678#page/46/mode/1up
Once the link downloads you'll see two facing pages of the baptism register. Mary's baptism is the 8th entry down from the top of the left-hand page. You can enlarge the page by means of round icons in the upper center/ right of the screen. The icons are white with green backgrounds. You can also access the full-screen function by clicking on the last icon on the right with the two arrows pointing northeast and southwest.
Mary's baptism record shows that her parents were Patrick (Keating) and Margaret Maher. The sponsors, or godparents were John Ryan and Margaret Maher. The godparent Margaret Maher could have been a cousin to Mary's mother, Margaret Maher.
I looked for the marriage transcription of Patrick Keating and Margaret Maher at the Find My Past website, but didn't find it. However, the National Library of Ireland website link shows that the Cashel and Emly marriage records go back to 5 January 1793, which means that it's possible that Patrick and Margaret were married sometime before that date. The National Library of Ireland also shows that Cashel and Emly baptism records are available from 11 November 1793. See: https://registers.nli.ie/parishes/0253
But I did uncover the Find My Past baptism transcriptions, linked to copies of original baptism records held by the National Library of Ireland, for two more children of Patrick Keating and Margaret Maher. The oldest of these children is William Keating, who was baptized in the Cashel and Emly Parish on 5 August 1794. William's baptism is the 6th entry down from the top of the left-hand baptism register page at: https://registers.nli.ie//registers/vtls000632678#page/11/mode/1up
William's godparents were Richard Maher and Margaret Costello. I also found the 12 May 1796 Cashel and Emly baptism for James Keating. His baptism is the 7th entry down from the right-hand baptism register page at: https://registers.nli.ie//registers/vtls000632678#page/27/mode/1up
The first names of James's godparents are Thomas and Betty, but I couldn't readily decipher their last names because of the handwriting.
Concerning John Whelan, if he had been born and baptized in the Ballingarry Catholic Church, there will not be a baptism record for him. as Ballingarry Catholic Church baptisms do not commence until 15 June 1814, some 16 years after his approximate year of birth of 1798.
I only found the FMP transcriptions of two children named John Whelan who were baptized in County Tipperary from the years 1793 to 1803. Both were baptized in the Carrick On Suir (South Tipperary) Catholic Parish. One of these children was baptized on 10 December 1796. His parents were Patrick Whelan and Catherine Walsh.
The other John Whelan was baptized on 6 April 1798. His parents were Patrick Whelan and Catherine Shanahan.
A Google Map shows that Carrick On Suir, by the shortest modern day route, is 21.3 miles south of Ballingarry. See the map at: https://is.gd/U9VuJl
Kind Regards Jackie,
Dave Boylan