a bit more details about how i see the Traitor Lord interacts with the Mantis Lords (at least, pre-infection)

the First Lord: he has huge respect for her, considering she is also his oldest sister, so he want to prove himself yet can't understand why his sister seem not impressed at his achievements.

The Second Lord: he considered her as a rival, someone he need to surpass in order to prove his worth. Funny enough, she does not think of him as such, she rather feel confuse a lot of times when he becomes more competitive (bro, we are suppose to be a team)

The Third Lord: he and her, on the surface, seem to have the most normal relationship, deep down, both feel slightly insecure about being left behind, being considered as the weakest of the bunch.