Looking for info on William Sheehy/Shea

[KC83]

I am looking for information on William Sheehy, most of the info i have is by word of mouth.
William Sheehy/Shea
Born 1857 to Daniel Sheehy/Shea and Ann/e Ryan
Last known whereabouts Clonmel

The only official documentation i have is a marriage certificate for William, he was married in May 1883 in Cardiff, his father is listed on marriage certificate as Daniel Sheehy and is also listed as deceased at this time.

Any info on where to start would be greatly appreciated
Thanks

[Milliepede]

What was his occupation on the marriage and who was his wife?

Are they on a census in Cardiff after the marriage.

[KC83]

William was a labourer and so was his father Daniel, William married Mary O'Connell, i have traced the family in the census, they settled in Aberavon, however William came from Clonmel (word of mouth) and i can not find any info for William before his marriage in 1883. Although he was married under the surname Sheehy, he was using the surname Ryan later on as some of his children are listed as Ryan in a school in Glynneath

[Milliepede]

I can't see him on a census - what surname is he under in 1891 etc?  Any children born in Wales?