A bit to start with;
In may 1916, a listing was made of all enemy aliens in Tonga, by the British Consul. This included all German subjects, including Tongan wives of Germans, who were thus German.
The list includes;

in Haafeva, Haapai;
Walter George Quensell, age 36, born He??ustedt, Germany; nationality German; trader; male; commenced residence in Tonga July 1903; Military service- Marine Extra Reserve;

George Dugald Quensell, age 8, born Haapai; nationality German, born in Haapai.
August William Henry Quensell, aged 6, born Haapai, nationality German, born in Haapai
Anna Elfriede Quensell, aged 4, born in Tonga, nationality German, born in Tonga
- no wife or mother given for these children.

In Lifuka, Haapai;
Emma L Hoeft, age 20 born Tonga, nationality German, baker, female, born on Tonga

In DH&PG premises, Lifuka, Haapai
Charles Hoeft, age 54, born Germany, nationality -; yardman; malecommenced residence in Tonga 1883; no military service

In Folua, Haapai, Albert E Hoeft age 26 born Tonga, nationality German, trader, male born on Tonga, no military service
........
No Mrs Hoefts mentioned