<human>: Provide a brief overview of the text.

First off, I have no indication to believe that anyone is being abusive here. I believe they are just not getting along. She has asked that she stays with me for a while since things aren't working out between them. I do not plan on sticking my nose in their business or offering advice, since I've never been married. I do not plan on taking sides, although I plan to offer a safe environment for my sister until she figures out her next move, should they fix their marriage, or otherwise. She is independent and not the type to be a mooch or live off of relatives, so I'm not worried there. Does anyone have experience with this, where I can avoid common pitfalls, or set up clear boundaries?
<bot>: my sister is not doing well in her marriage, and might need to stay with me in the near future. Need some advice or insight on the best way to proceed.