<human>: I've always been pretty close to my sister, despite her occasionally being an awful person. She's a bully, lazy, manipulates people seemingly to make herself look better, and tells lies in order to cause problems amongst people - she has an extreme high school mentality. I'll frequently call her out, and accompanied with "knock your shit off" lectures, we're able to get along enough to have a decent relationship.

Her living situation imploded and now she needs a place to live. My partner and I have an extra bedroom and she asked to move in with us "temporarily." She said it'll be for just a short time, but I don't believe that. I've seen her in similar situations before (housing, jobs) and she's frequently ignored ultimatums and promises regarding them.

Also, she doesn't get along with my dog. My dog is a rescue and nervous around people, and my sister will bug him over and over until the dog gets upset, despite everyone constantly telling her to back off and leave the dog alone. We have to put the dog outside when she's over, and I feel like putting him in a high-stress situation is completely unfair to him.

My partner thinks we should let her move in temporarily, provided we have her sign a lease and give her a strict move-out date, because "she's family and family's there for each other." Everyone we've approached for advice said the same thing.

My partner thinks that'd it'd make us look bad to turn her down without at least giving her a week or two trial period, while I think it'd look worse when we inevitably have to evict her.

Am I an awful person for not wanting her to move in? She is my sister, but I feel like I should go with my gut and not let her. Or are my partner/friends right - does family trump all?

Can you condense the text into three sentences or less?
<bot>: My sister's an awful person and wants to move in with my partner and me. Am I a shitty person for wanting to say no?