Kia ora

My name is Kataraina I am trying to find out anything regarding my great grandfather and his family.

My grandfather was William Benjamin Thomas born June 1910, his father was William Thomas and his mother Hera Matiu.
My grandfather has four siblings that we know of Marietta, Mina, Shophie and Maraea. We know my grandfather went to Waitaruke Convent in Kaeo where they lived until his mother passed away when he was 14 years old. Apparently his father remarried straight away and my grandfather left Kaeo. I do not know if there were any children from my grandfathers second marriage or even where he may be buried.
My mother has been told that there was a whanau in Tautoro that used the name Thomas Rota that may be related but we are unsure.
If there is anyone that may be able to offer any info regarding my grandfather that wou ld be fantastic.