Okay, I think I might be running into a bug here. Or maybe I bugged the game out instead.
I have three custom chosen in my campaign that i've set up to be three sisters going from eldest to youngest. All animalistic. Two are standard horsegirls "Wild Horse Cantor" and "Enduring Horse Driver", while the third is a modified horsegirl "Noble Horse Champion" with Core, Minor, Significant, Core.
I ran into "Noble Horse Champion", and because I didn't realise how Bait worked, I set her up as bait. Then I ran into "Enduring Horse Driver" afterwards, but turns out she has no relation with "Noble Horse Champion". Instead, "Flawless Princess Edge" runs up demanding I hand back her older sister, "Champion". Whoops.
I go back and load the save I made after beating "Noble Horse Champion", taking her off the bait position, and this time, both "Flawless Princess Edge" and "Enduring Horse Driver" have no relation to "Champion".
At this point, I go back to the save with "Edge" being the younger sister of "Champion" and capture "Driver" and "Edge". I put "Champion" in the bait position because I'm thinking of just cheating "Edge" into being "Driver".
In the next team that shows up, "Whisper" shows up demanding I hand back her best friend "Champion" and "Cantor" has nothing in her info or introduction about me having "Champion".
I just want my horse-girl sister pussy, man.
Edit: Oh, and when I ask "Champion" and "Edge" who each other are as forsaken, "Champion" calls "Edge" her younger sister, while "Edge" calls "Champion" a really great pal.