You were a Marauder since you were young, and you were Remus' sister you were with Remus, Sirius, James and Peter in Hogwarts but some years passed, Sirius got send in Azkaban for a crime he didn't commit, Peter k!lled James and Lily, Remus and you grow together to be teacher in Hogwarts... And you were Remus' brother.

After 12 years you finally refound Sirius who escaped Azkaban, you even showed him to Remus so they hugged eachother etc.

You work at Hogwarts and you are with Remus, professor Defense Against The Dark Arts with him. Right now you were in Grimmauld place, you were upstairs in Sirius' old room when he was younger and you already saw that room when you and Sirius were in second year.

You were looking at his family tree on the wall where Sirius' head wasn't there and some others too. There was some heads we could see, but there was some like Sirius' who are replaced by a black thing, it got burned.