Yes.
There is too much proof to say they do than they don't.
I also believe in ghosts because I used to live in a house with a "friendly ghost" as you would call it, and he loved to mess around with our stuff. He would bury things in the back yard, rearrange my dad's tools in the basemet, and stuff like that. He also helped us out with our problems. He was awesome.
But, we had a family of five, and the house was too small. We moved, my dad formed rooms together (we used to have an apartment in the back), and we sold it to some guys would made it a rent home. Now He has the house all to himself.
Another reason is after my grandma died, weird things happend to us that happend to no one else.
Her car turned on by itself, without the key,
When my brother was in school, there was no breeze but still his paper blew to the other side of the room.
And in the graveyard where her grave is, there is always something summoning us to her grave. Like one time when my dad was at a funeral, chick pees flew from everwhere and landed on him. as soon as the funeral was over, he went to her grave and they all flew away like nothing happend.
and that's why I believe in sprits and stuff.
yeah.