I'm very confused is her sister and rosemond twins?

I don’t think so, maybe they just have the same hair color.

Actually I was going to comment that too but it looks like the head shape is slightly different on the sisters hair is Somewhat darker I believe the fucked up with the isolation to change the color because they look way too alike I will also believe this is just holler and she has more of a hourglass shape than the other girl but they still fucked up I also think Rosemead’s hair is a lot shorter maybe a little bit more Frumpy in the drawing style that it is