Hi Mike
So, according to Pam's findings, Mabel's mother is Ester Goode who was born in 1857, St Lawrence, Jersey - which ties in with the birth certificate.
In 1861 there is one Esther Le Grand with the right sort of birthdate in the whole of the Channel Islands:
1861 RG9/4408/18/5
Trinity, JerseyJames Le Grand, head, 31, Mason? b. St Lawrence, Jersey
Sedisie? Le Grand, wife, 33, b. Port Bail? France
? A Le Grand, dau, 7, b. St Lawrence, Jersey
Esther Le Grand, dau, 5, b. St Lawrence, Jersey
Ann Le Grand, dau, 1, b. St Martins, Jersey
I'm afraid the handwriting is terribly difficult to read, and by 1871 the family seem to be all over the place - and the handwriting hasn't got any better either!
1871 RG10/5762/75/13
Trinity, Jersey?elisie Ann Le Grand, head, mar, 42, employed on farms, b. France
Anne Le Grand, dau, 10, scholar, b. St Martin's, Jersey
Eliza Le Grand, dau, 8, scholar, b. Trinity, Jersey
Philip Le Grand, son, 6, b. St Martin's, Jersey
1871 RG10/5762/54/1
Grands Angres, Trinity, JerseyJohn Neel, head, 56, farmer of 18 acres, b. Trinity, Jersey
Ann Neel, wife, 55, b. S. Johnns? Jersey
Louisa Jane Neel, dau, unmar, 24, b. Trinity
Emma Sophia Neel, dau, unmar, 22, b. Trinity
Adolphus F Neel, son, umar, 20, b. Trinity
Margaret Neel, mother, w, 78, annuitant, b. St Helier
Janeton Manet, servant, unmar, 59, general servant, b. Trinity
Pierre Burzeval, servant, unmar, 23, farm servant (indoor), b. France
Mathurin? Roualt, servant, unmar, 18, farm servant (indoor), b. France
James Le Grand, boarder, mar, 40, stone mason, b. St Lawrence, Jersey
1871 RG10/5760/129/18
"Sea Porth? Villa" Main Road, St Clement, JerseyElic (Elias) Amy, head, 77, retired farmer, b. Trinity
Elizth Amy, wife, 68, b. Trinity
John Amy, son, unmar, 33, Attorney Royal Court Jersey, b. Trinity
Esther Le Grand, serv, unmar, 14, general servant domestic, b. St Martin
I'll leave you to find them all on the 1881!
Cheers
Koromo