We've lived in this house for the past 20ish years, pretty much my whole life and it is a relatively old house. In its current form it was built in the 1940s after our town was destroyed by the war but previous to this there had been foundations of another home so it's more likely than not that something is attached to the house or at least the land.
Over the years we've had several "experiences" from footsteps in the upstairs bedrooms (notably seeming to come from areas that are no longer walk-able due to built in furniture like wardrobes and window-seats etc) to things seemingly being thrown from shelves, objects that seem to be lifted up several inches before being dropped with great force to the ground- we usually try and explain these away with more logical explanations but having seen a perfume bottle separate from its lid mid-air and have both pieces fly in different directions or seeing books be swiped from a shelf and travel several metres across a bedroom this becomes increasingly difficult to explain away- however it's always relatively harmless.
Another incident that is difficult to explain involves my younger siblings. When my brother was very young he woke up one morning and informed the family that during the night he got out of bed and came downstairs where a lady yelled at him to get back to his bed. My sister went on to tell us an identical story several years later (each sibling had been around 2/3 years old when this happened and it only ever happened to each child once). We have over the years tried to explain this as they've probably dreamt it but the fact that both described the lady in nearly identical manners does worry us especially since by the time my sister claims to have come across the "blue lady" my brother could no longer recall it making it nearly impossible that he told her about it.
They claim to have seen this lady in the newer part of our home which my family built in 2006- I've never felt too comfortable in that part of the house despite it being the newest area. All that was on that ground before we built there was a single blossom tree and grass.
Several years have passed without too much incident- the books being thrown several metres across my bedroom a few months back had been the only solid activity I can recall for a few years. However, my mother woke up a few mornings ago and was on her phone checking social media and whatever else when she thought she heard my sister coming down the hall (my sister always asks my mum to do her hair in the mornings despite being old enough to do it herself) on this particular morning my mum couldn't be bothered doing my sisters hair so pretended to be asleep. After a few seconds she heard a voice saying "mum. Mum. Mummy" she kept her eyes shut still thinking this was my sister and feeling as though a person was stood at the side of her bed. However when several minutes passed and my "sister" hadn't tapped my mum's shoulder or jumped onto her bed my mum opened her eyes to see nobody had been in her room at all.
My parents' bedroom is directly above the room where my siblings say the lady yelled at them, however both siblings claim the lady was very old while my mum says the voice was a young child.
I was wondering if anyone has any ideas as to what is going on. There definitely doesn't seem to be much of a pattern to the activity and things can start and end just as quickly- the most common thing being the footsteps and the least common being this new "voice". Having lived here so long I'm not entirely bothered by most of the things that happen as they've never harmed any of us but the voice calling out to my mum and addressing her did spook us slightly as it is the most concrete thing that has happened here.