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That 1971 death is also online-
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1972/04113/4042279.pdf
Usual residence was Cappagh, death in Waterford, married.' Congestive cardiac failure' listed as cause of death rather than heart attack.

Welcome to Rootschat  Popsie58 who started this thread hasn't been online since 2011.

Another thing to be aware of it blatant error on Find A Grave.
Our present church was built in mid-1800s and the first burials were a little bit later (the previous one had no burying ground). No burial register was kept and probably the first attempt to make a record of plots (not burial, just plots) was in the 1950s when the minister took the old (retired) sexton about the ground any wrote down what he could remember.
Now, we know there were no burial at the church until the 1840s (it was part of our farm before that) but someone has entered dozens of 'burials' there in the 1700s for families that left in 1718! Quite a few times I have seen photo requests for these phantom headstones and have contacted the person to explain these burials are incorrect. I have contacted the couple that put the details into Find A Grave but they said they will not make any changes until I send proof!

I think you can't go by what your friend has 'remembered' to trace Charles Brady. So far they seem to have claimed he was born on a certain date in 1898 (based on death index perhaps?), a younger sister 'Rosaleen' (I have failed, so far, to find a her in census records or suitable match on Irish Genealogy for her death (or birth) using Ros* as the first name) and now a father called 'Patrick' which is a totally different family than the Charles born in 1898.

Usually one would work back through available records but since the death isn't quite clear-cut it might be better to start with Charles' marriage- if name of wife is already known- to see father's name and occupation.