Hi,
Do you already have the following information about Griffith Thomas' second wife Elizabeth and family?
Marriage: Griffith Thomas, 30, widower, mariner (merchant service) of Ty Hir, Llanallgo, son of Owen Thomas, labourer married Elizabeth Jones, 22, spinster, Ty Hir, Llanallgo, dau. of William Jones, labourer at Llanerchymedd Registry Office 11 Feb 1910.
Births: William son of Griffith Thomas & Elizabeth Jones, 14 Mar 1910, Llanallgo
Elizabeth dau. of Griffith Thomas & Elizabeth Jones, 24 Dec 1918, Llanallgo
The 1911 census for Ty Hir, Moelfre (RG14, 34560, 1, 1) suggests there was an older child, Annie, born Liverpool 1906/7.
I can find three death registrations which seem to be relevant:
Ann Thomas 6 Dec 1907, Llanallgo, age 29, wife of mariner, merchant service Griffith Thomas. Informant Thomas Jones, brother.
Annie Thomas 13 Apr 1916, Llanallgo, age 9, dau. of mariner, merchant service Griffith Thomas. Informant Annie Matthews.
Edward Thomas 29 Aug 1907, Llanallgo, age 3, son of mariner, merchant service Griffith Thomas.
Informant Thomas Jones, uncle.