Children were normally considered precious amongst the Elves; however, relationships amongst Elves could go awry just like they could amongst Men, Dwarves, or any other Folk. While there was nothing Lord Glorfindel could do about his little warrior’s past, he could nurture his future.

“fëa (pl. fëar), and hröa (pl. hröar), are Quenya terms for ‘soul’ (or ‘spirit’) and ‘body’. The Sindarin equivalents are fae and rhaw, respectively.”

Tolkien Gateway wiki.

Elves are cuddly vampires instead of crunchy vampires. Lord Glorfindel is also your old fashioned grandpa raising a 20-something-by-human-standards horrifically abused elf lad adult.