Beowulf Poem: Is Cain a Nephilim?

In the Beowulf poem, Cain is said to have been a kinslayer. In Anglo-Saxon society, and like the Germanic Iron Age, to be a kinslayer is the worst possible sin. If you can't trust your brother or cousin, how are you going to survive as a people? This is actually one of the big questions that is raised at the end of the poem. The woman singing his funeral dirge says, well who's going to fight for us? And if he starts hoarding gold, then he doesn't, right? So these are basically the two kinds of evil that we've exemplified by the monsters,.