« Reply #3 on: Sunday 04 July 10 15:25 BST (UK) »
have you looked at Isabella's marriage certificate from 1914? That should give her mother's maiden name.
If you search for Robert Murphy & McGirr in 1914, it's the only record that shows up. Her first name shows up as Isabell.
Christopher's birth registration shows up in 1904 with surname recorded as Magirr.
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb