Tenants with good and bad credit scores

[Eli M.]

Dear BP family, 

I have encountered an interesting issue here; a sister and a brother are interested in renting a house of mine, the brother has a good credit score but the sister doesn't. How should I look at it? What's the best way for me to protect myself in case they have a fight and decided not to live together anymore?

Thank you all in advance,

Eli K