The Sorting Hat
There are Slytherins, Gryffindors, Hufflepuffs, and Ravenclaws. But everyone at Hogwarts is connected in some way. Whether you are a Slytherin, Ravenclaw, Gryffindor, or Hufflepuff you are basically related to those around you. Even if you are pure blood, half blood, or mud blood(it pained me so much to say that.)
What house are you? Slytherin? Gryffindor? Ravenclaw? Or Hufflepuff perhaps? How do you know if it's right? You don't. You know yourself more than I do. So you be the judge of whether it is right or not.