Odd family flirting...?

Okay so, I'm not worried about my Fiancé at all but one of my female family members in my house is a huge flirt! Lately everyone is getting closer and getting to know each other more and I love it but she's being extra friendly! They goof around and its all fun but you can look in her eyes and tell she's into him. I've had like 4 dreams the past week of them hooking up... It's just making me feel crazy for thinking about it.