Question: can elves and humans mate lord of the rings

Answer: Yes, In J.R.R. Tolkien's fictional universe of Middle-earth, the Half-elven (Sindarin singular Peredhel, plural Peredhil, Quenya singular Perelda) are the children of the union of Elves and Men. Of these, the most significant were the products of couplings between the Eldar (the Elves who followed the Call to Valinor) and the Edain (the Men of the Three Houses of early Men who allied themselves with the Eldar in their war against Morgoth).