Ghost and Angel Pictures

This is a very intriguing photograph. First of all, there is no doubt that entities exist, whether they be intelligent or residual, and I have no doubt that your family's experiences in the house are real. At least 90% of purported ghostly sigthings have an earthly explanantion. Most anomalies in photographs can be attributed to insects, dust, naturally occurring orbs, or most often what is called "matrixing". The brain is wired to turn chaos into something familiar. For example, one could look intensely at almost any painting and pick out faces in the brush strokes. The brain seems to do this very well with light play too. I can definitely see the face that you mention. I think that some unique light play is the culprit for this cool looking spirit. My guess is that what you are seeing is the camera flash relecting onto the wall, most likely from the ring or an earring being worn by the woman on the right (maybe that's you!) I have seen quite a few images appear on walls like this when light has reflected off of objects like diamonds or crystal..any multi-angled cut glass would do it. I am not sure if the source of the reflection is on your person or out of the frame of view, but if you were to try to recreate it and find the source of the straight, thick reflection, the object guilty of causing the face will most likely be nearby. This is just an explanation of what the image could be, and I certainly cannot rule out a paranormal cause, but it is most likely coming from a reflective surface. All the best to you and your family!