??

i think it means like lovers shouldnt cheat? i have no clue

It means that because they're related by blood he's going to become like her... I think

This makes sense

Maybe the dad cheated and she says blood doesn’t cheat idk

or it could be that seeing that they are carnivores, blood is the only thing to reveal their true selves so no matter how they put up a façade (cheat) blood cant cheat. but probably im reading too much into it.