These images are very intriguing from Grace Colgan.  The smoke-like presence looks like spirit mist, and if no one was smoking in the home, there is no other explanation for it.  Do these photographs show the image of an angel, possibly the mom there with them in spirit?

"I took these photos with my niece and sister when we were having fun almost a year after my mother died in that house of cancer.  I took lots of  pictures and five of them had the image of an angel."