Sue:
Richard and Mary married in 1908 and the names of their fathers are on this document https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_ret...
Possible 1911 census record http://www.census.nationalarchives.ie/pages/1911/Kerry/Knocknagashel/Fea... (Mary would have been born before parent's marriage)
Found a couple sisters to Margaret.
sister Catherine 1920 seventh record https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_return...
sister Elizabeth 1912 second record https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_return...
I think Richard had various jobs on a creamery train.
Let me know what questions you have.
Roger McDonnell