The character Lomion (Maeglin) is implied to have been abused by his father. When Lomion is 80 years old, which is around the equivalent of a 16 or 17 year-old, his father attempts to murder him with a poisoned javelin, but Lomion's mother, Aredhel, takes the wound instead and saves Lomion's life.
It is said that Aredhel "was not wholly unwilling", but I do find that rather difficult to believe. She might have been under some sort of enchantments. It is unclear.