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A bit whinging and pedestrian, but you can mine for some worthwhile information. Unfortunately, the author 'barely understands' some of the substance.

In fact the Old English plural -en exists in several words, including brethren (plural of brother), children, and even men and women.

Old English is also responsible for goose/geese and tooth/teeth, although I barely understand the OED's explanation of mice: “The Old English plural mys arises from i-mutation of the stem vowel, and shows the normal subsequent development of Old English y.

Stories of strange plurals