A fourth union of Elves and Men??

[Lachwen]

Elves and Men are evidently in biological terms one race, or they could not breed and produce fertile offspring

Oh dear, I hadn't thought of that. *promptly disappears in a puff of logic* Though I should have, seeing as how both my parents are scientists... Maybe it's a good thing I'll be starting school soon, my brain has obviously atrophied over the summer.