A birth registration was found for Mabel M M Offen: Mother's Maiden Surname: Amos; Date of Registration: Jan Feb Mar 1920; Registration district: Canterbury; Registration county: Kent; Volume Number: 2a; Page Number: 2307.

In 1929, Mabel M. M. Offen, 9 (along with brother, Horace W. J. Offen, 12) arrived at Fremantle, Australia, in a group of 37 children from the Child Emigration Society, Strand, London, England. He was placed in Nelson Cottage at Fairbridge Farm School, Fremantle, Australia.