There have been several deaths in and on the site of the house I live in with my mum and my siblings. The only ones that have been made clear to us is of a little girl who drowned (I live near a farm and the street that I live on used to be farmland) and a "dominant" male who's intention is unclear. Though I feel that there are more than these two.
The house has always been active and things would always disappear/go missing, you'd see things out the corner of your eye, you'd hear things when you're the only one in the house, the front door will always slam shut when you're alone and my dogs go mental because they can see something but it's recently got more active in my opinion. Even now, I'm in the built on extension and I can hear what sounds like furniture being dragged across the floor and it's broad daylight.
We're actually the longest people to live in the house (we've lived in it about 14 years?). Also one of the spirits here is apparently violent and it strangled my dad in his sleep (before him and my mum broke up) and he refused to sleep up there any longer.
Last year me and my mum and a couple of other family members went up to Durham for my Great-Uncle's and Auntie's wedding which was in a standard church. After the ceremony we all took photos of each other. I have a plain, old digital camera and my mum has a professional photography camera and we were also taking photos of each other. Mine didn't get anything (and I was taking photos of the graveyard and everything) but my mum's photos turned out weird. There's no explanation for it to be fair because we looked through her other photos that she had before and the ones after and it hasn't happened again.
In these photos, my Great-Uncle and his wife have a white mist over them on all the photos they have together. This doesn't make sense because no one was smoking, there was no mist! My Uncle Jason, my cousin and my Auntie Lisa were over on the other side of the room at the time. My mum took 2 photos of my Uncle Jason and my cousin together and they look as if they are being blurred into each other, which again doesn't make sense. My Auntie Lisa also has a blur right to the side of her head and it's pretty unmissable.
I'm going to agree with BrokenTree's assessment because there is either a reflected light (camera flash from your uncle's forehead), a direct light source in the frame (sunset through a window, a candle), or a combination of the two (picture 3) and the blur is in roughly the same location in each image. I suspect there may be a small chip or fracture in the lens which is more apparent when an intense light is present in the image.
I do look forward to more details about the activity in your home, as this sounds like you've lived with very active ghosts. (It may be a an odd reaction to one of my personal fears, but I'm really curious to know how you learned about the girl who drowned.)
Best,
Biblio.