Thanks so much for the pointers! I'll get onto that soon as possible.
I am descended from none of the children listed - my grandfather, Edgar Richard Ferdinand/Ferdigan/Frederick (the order of given names changes dependent on where I look - we knew him as Edgar so I am running with that!) Howell was born 16 march 1916 to Richard and Ellen Frances Howell in Cork - that was the only information I had to begin with. I've since found only the couple you also found who I feel certain must be "mine".