In a bilingual community (in the sense that two languages are used in the
community, while not all members of the community are necessarily proficient
in both) with two completely unrelated languages, such as the Eskimos
in Alaska (Yup'ik and English) or the Apaches in North America (Apache
and English) it will probably be more difficult for the children to comprehend
and acquire the second language than in a community like West
Frisia, where West Frisian and Dutch are closely related West Germanic
tongues. On the other hand, the incidence of interference will probably be
more marked between two related and similar languages than between two
unrelated ones.