My haunted house

So this story happened I think one or two years ago and it keeps buzzing me.

It started when I was chilling upstairs on the sofa in the living room (a little tour of my house. The front door is downstairs. Then a little hallway that takes to the stairs and on top of the stairs there is the door to the living room from upstairs) ok so I was chilling on the couch, keep in mind that I was home alone! I was scrolling on my phone waiting for my family to come back. After some time I heard the front door (from downstairs) opening and closing loudly , I thought it was my dad, I heard the slippers ( the sound when you put them on) and then the sound of them rubbing against the floor while walking , this part is normal. So the slippers started walking towards the stairs and then walking upstairs step by step. The sound getting louder as it came closer to the door from upstairs. I was happy that my dad is finally home so I waited for him to enter but no one did. I waited and the sound stopped. I was so confused cause I swear I heard the front door and the walking. I called my dad scared asking him if he was home and he said “no” he was still on his way. I was like “okay maybe it’s mom or my siblings” so I walked downstairs after a while and no one was home. Not after long time , my brother and my sister came home so I asked them “you just got home?” And they said “yeah” so I asked again “and you didn’t came home before?” And they said no …. I still have no idea who that was or what that was but I swear I heard it!