The Playful Ghost

I think I've lived in my house for about 6 or 7 years now. I was around 9 years old when we first moved in and am turning 16 on January 1st.

When I was little, things would go bump in the night. But I would brush it off as one of our two cats. (We have four now.) Lately, weird things have been happening and it's starting to scare me.

I first started gaining suspicion when I found a decorative AIW bottle on my bedroom floor one day, the food dye that filled it completely gone. It was on a shelf high above my dresser, where my perfumes and nail polishes sit. It could not have been a cat, as the shelf is too high up and things would have been knocked over. Things settled down after that.

A few months later (presently) things started picking up. The bathroom faucet turned on when my back was turned. My cat looks around my bedroom with wide eyes when no shadows of bugs are around. Loud crash from bathroom. (Could have been a cat.) I don't know what to do. It seems a lot of the stuff going on is directed at me, and I don't know why.

My brother recently got back from British Columbia visiting his girlfriend, and her house was seriously haunted. He came back with videos of hats flying off dressers, knifes being thrown... The works. We've also had renovations done to our bathroom.

My grandpa passed away on my birthday in 2008. Could any of this be relevant? I don't necessarily think the ghost in my home is trying to harm me, though maybe it just wants to stir up some fun for itself?

Any feedback would be deeply appreciated.