A/N : Hi this is the first chapter of a story I am writing with my best friend ProngsPadfootMoonyCJC! It's very short but there will be two short chapters posted, this one and one more, before we get into the good stuff at Hogwarts. You may question some of the choices we have made like holding Sherlock back but there are reasons for all of the decision we have made. If you are curious about a decision we have made then feel free to PM me. We will update regularly but we are going into a long exam period so they may get less frequent but we will try and keep a schedule when it gets to that. Thanks for reading!

We don't own Sherlock or Harry Potter.

Ariella POV

Sometimes it's hard being the great Sherlock Holmes' little sister. I mean I am just as smart but I am just, more human. He's brilliant, though I guess both my brothers are. I have a lot to live up to, even at 11 years old. Mycroft, Sherlock and Ariella. The famous Holmes siblings. Wizards, not that the muggles realise this, and a family of brainiacs.

Mycroft is 26 and has the entire muggle and Wizarding government wrapped around his little finger. Sherlock is 13 and already solving police cases. He started by finding the unsolved ones and solving them but then the police realised he was too smart and could be of use to them so now he helps them. Unofficially of course. He works with the aurors during the school year and the police during the holidays. Then there is me. The youngest Holmes sibling and most overlooked. I have helped Sherlock on several cases not that the police know that. I was always close to Sherlock, well as close as anyone can be with Sherlock, but both my brothers are way too overprotective, Mycroft especially. Occasionally, and I mean occasionally, Sherlock will step in against my eldest brother but not very often. My parents are protective too so Sherlock hasn't started at Hogwarts yet as they held him back so he would start with me.

Now I am starting my first year at Hogwarts school of Witchcraft and Wizardry along with my elder brother. Hogwarts won't know what's hit them. They thought having one Holmes there was bad. Try having two Holmes' in the same year.