sib > kinsman
5 To Elves, but sprung of seed terrestrial,
seed terrestrial > earthly offspring, mortals
6 And whilom by false Faeries stolen away,
whilom > formerly, of old
7 While yet in infant cradle he did crawl; 8 Ne other to himself is known this day,
Ne other > (Nor any other [version of events]; cf. 110.65-6)
9 But that he by an Elf was gotten of a fay.
gotten > begotten fay > fairy, Faery
303.27