Many thanks to Dundee et al.
Clearly I just need to get some more sleep, and let others solve the problems!
But these "finds" bring up two important questions for me.
First, one of the first things I look at on Ancestry are other family trees with the same person.
With regard to "my" William Crean, Ancestry has from the started prominently hinted at trees that are not him, or him but wrong wife and children. That is a William Crean born on correct day, 10/3/1877, two giving correct Co Wexford location and his actual parents, but then having him marrying an Ann Jane McGuinness in Dublin in 1907, and dying there in 1920. That William Crean was actually a completely different fellow - but from first to last Ancestry keeps pointing to these incorrect trees.
On the contrary, I have never received a "hint" pointing to an Ancestry tree with his actual first marriage and family, to Ellen Murphy, even though there are some.
So, go figure - constant, constant hints to a completely wrong William Crean, while none to the correct fellow, even though there are trees with his correct first family.
Which brings me to his second marriage, to Dora Kenny. So far, I have not encountered *any* trees on Ancestry containing this second marriage! I just looked again, none are shown when I look at "all family tree results for William Crean". Same if I look for Dora Kenny.
So, what is the trick - how did several of you find trees with his wife Dora?
Then there is the death for Dora in 1968. Clearly is Dora Crean, so I was initially kicking myself - how could I have missed this! But when I search on IrishGenealogy, it doesn't turn up. Must be misindexed? One obvious misreading would be as Crow, but does not turn up under that either.