So one of them was his old self mother/sister? How does that work.. did he oyakadon with his mom and grandma? Also you go girrl be his udies
Elf girl wasn't his actual mom, but views herself as it. Presumably she's much older than she looks(being an elf) so her views on him are skewed; as a mother and teacher who raised and trained him, and as a sister and lover who traveled with him as part of his harem.
Kind of like Nia, he views her as a precious daughteru, and she may view him as a fatherly figure, but she also wants to jump his bones