A Small Boy

I live in the United Kingdom in a small council house. My brother died when he was small, so he has a ghost who stays around the house. I'm the only one who can see and hear him. Okay, so here we go.

I was lying in my bed, and I heard pinging noises, I also felt something on my bed, it was like someone put their knee on it. Then all I hear is banging on my wall, one, two, three. One two, three. One, two, three, four, five. I got scared and shouted "be quiet!" Then nothing. All of a sudden I see a blue light at the bottom of my bed show up, and in the blink of an eye it disappeared.

The next day I was looking in the fridge for something to drink, I turn around and see a light misty blue outline of a small boy, aged around 5 or 6. I stared, and he stared back, as soon as I blinked he had disappeared.

I seem to be the only one who can see and hear these things, as I told my parents and they said

"No, no, we haven't seen it. Maybe he likes you."

So, do you think he could hurt me, or just wants to be friends?

Also, my dog and cat act weird. When I was younger the cat was staring at the staircase, with really, really wide eyes. She was growling and hissing with her ears pinned back, she ran away. My dog sits and stares at walls, drawers and closets at night. It's so freaky.