Vote over at TWC and you can see Vincent being Vincent.
The Walters family just hates vines, what can I saw. Malaya takes care of them with claws, Vincent takes care of them with a weed whacker. They're just a vine hating family. (Which actually makes sense, because I'm sure Vincent has quite a few thoughts about invasive species, and Connie would track as one.)
Elias has selective hearing because he fears no plants. He probably should, but he's used to being a werewolf who can just get away from stuff. And Charlene is used to defending herself in various ways with magic. Vincent is the one who should rightfully be freaked out here, but that's not how he lives.
I'd write more, but I have half an hour to make myself clean and presentable for a meeting, so I have to go do that now. See you guys tomorrow!