Investing with family invovled

I live in SoCal. My sister is moving to Vegas. She would most likely end up renting a place. I've been thinking of purchasing a investment property in Vegas. Is it a bad idea to mix the two? Buy a place for her to rent back to me? I would also like for her to eventually benefit from some of the profits if I were to sell down the road since she'd be paying for the mortage. I would just help supply the down payment (and get a little bit of cash flow) Thoughts? Thoughts on how to structure something like that so I'm not accidentally putting either of us in a bad position?