This is my first story I'm sharing here, so please don't mind any grammar mistakes.
When I was 10, my younger sister was born. It was a great time that year, as I finally got to see her. However, strange things started happening after she came home from the hospital. I would see shadows going around the house, being most active at night. My older sister, who was 12 at the time, would see them more frequently then me. There were a lot of them going around too.
One night, my younger sister started crying. She wouldn't calm down or anything. Extremely tired, my mum gave her to my dad. She calmed down after leaving the room. Upon waking in the morning, he told her that she saw something exit the room, almost like a shadow. Another thing happened when said older sister saw a tall man with a top hat, standing inside that same room. In fact, during that time my mum's room felt uneasy to be in. I would close the door because of how scared I felt. Other times, she would see a figure in a white dress walk across our living room.
I also had some experiences with the tall man. I was taking out some trash out. Our bins were located next the stairs that lead into our house. This is were the garage and the washing line was situated too. There was a path that was scattered with rocks next to a green fence by the washing line. I was just putting the trash into the bin, when I tuned my head towards the rock path. Standing there was the man in the top hat. He was just there, watching me. I could fully see him too. It wasn't one of those fast ones who look almost transparent. He was opaque like an actual person. At first, I thought it was just my eyes playing tricks at me, but I looked at it for a good 5 seconds. Let's just say, I ran up those stairs faster then I could comprehend what I just saw. Didn't like going out there at night since.
My whole family are huge believers in the paranormal. That night, my mum called her parents about the stuff that was happening. I told her about the man and she already knew who he was, but asked why I didn't tell her. My sister also told he about the things she saw. Her parents said that they man in the top hat is my great grandfather, while the figure in the white dress is one of my other grandparents from my dad's side. They couldn't explain the others. They stayed around for a good two months before they just... Left us alone.
This all happened 4 years ago. Nothing like that happened since. Today, my family still doesn't know why they came. We speculated that my sister, who is now 3, may of brought something bad back from the hospital. Those shadows might be just dead ancestors protecting us and cast whatever it was out.
My younger brother was born from the same hospital. We don't know why it didn't happen to him, but to her instead. We moved out of the house 3 years later. Sometimes my sister cries and doesn't go inside her mum's room at night. We think she still sees something, but she's okay with it now.
However, we still don't know who came after her birth that triggered my deceased family members to protect us.