Henry appears with Joseph and Sarah on the 1901 census as shown above. Also on this census record is a Sloan noted as Joseph's brother in law.
It is hard to know what you are seeking. Are you wanting to go backwards or forwards?
So do you want to find the BDM details for Joseph, Sarah and Henry and going back earlier or finding the marriage, children, death of Henry going forward.
If going back I would not dismiss the record found for Richard. he may be a brother or uncle of Joseph and some times if we get stuck going laterally to find brothers and sisters can help get clues to go back further.
This is a good site
https://www.irishgenealogy.ie/en/as is
https://www.familysearch.org/search/The cnesu sites, that you have already had referred to are good especially for finding older memebrs as you can sort by age and then look to see how the older ones link to your family.
Also good is Griffiths Valuation