Things Happening In Our House

I'm here to get further information about the stuff that's been happening since last year or so. Last summer, I went to my room. I wasn't really paying attention to anything, but then I saw a weird grey shadow (?) around half a meter away from me and it jumped at me and then just disappeared. Few days later, I saw a see-through figure going across the road.

Today, I was laying on my bed and from the shelves where clothes are stacked up, a belt fell down without anyone touching it. There wasn't any possibility it could fall as it was tucked almost at the back of the shelf. I also heard it move once or twice while it was on the ground.

I was talking about my granddad, that passed away when I was 3, few minutes before and I was wondering if it has any relation?

Also, my dad keeps his grandma's ashes in the storage room that is next to my room. Mum said she sometimes heard stairs creaking while no dog was home. We didn't have a cat at that time either. Around a month or two, mum said she saw a shadow go away from my little sister's bed at night and my sister got scared and asked if she can sleep in mum's bed. Things similar to that were happening since my sister's birth.

It keeps scaring me, are there any things I can do? I don't feel threatened or anything, but these things keep happening at random times and I get a mini heart attack... I'd be happy for any information or help. I can't buy anything in this regard either, so please try not to recommend anything including money. Thanks!