Responses

I think a lot has to do with the fact that she's the first person that the brothers can open their heart to and actually love. You learn later on that they were taught not to love anyone because once you open your heart to one person it will make it easier to love anyone so at this point they don't even live their family. Since she can lift the curse, they feel like they can love her
I am in chapter 10 and I dont know if I am just overthinking this but does the brothers take care of her because she is their sister or they are taking care of her because she can undo the curse?