Lye Batenkaitos/Relationships

Louis Arneb
Lye shows some degree of care, as she is his younger sister. He repeatedly went out of his way to arrange meals for her, allowing her to experience lives of others just like himself and Roy. In both arcs 5 and 6, he's also shown to be somewhat protective of her; at some point even saving her life by overtaking "her" body and dodging Ram's attack which would have been fatal. It is unknown if he's aware of his sister's hatred towards him.

Roy Alphard
Similarly to his relationship with Louis, Lye shares a relatively one-sided love for his brother. He cares for him although not on the same level as he cares for Louis, and can be repeatedly seen criticizing Roy's decisions and his view on his approach towards his meals. Although it's worth noting every Sin Archbishop harbors hatred towards his fellow "brothers in arms"; having said that, comparing his relationship with both Roy and Louis is far from hostile.

Regulus Corneas
Lye can be seen having a rather non hostile relationship with Regulus. Both do hate each other but they respect their views and rights, with Regulus perhaps being a bit too pushy, questioning his never ending hunger which resulted in Lye snapping back at him, stating he dislikes lectures. At the end, they never became hostile towards each other; Regulus even helped Lye take out Rem.