I believe there are Angels among us

It took us a few weeks to get our Christmas tree up this year after loosing Jeremy on Nov 30 but we put it up knowing that it was something we could do to help our 7 year old feel better. We got the tree up, put on the lights and all the shiny balls and stuffed teddies that we had been collecting for the past few years and it looked pretty but it still didn't feel like Christmas cause our Jeremy wasn't here to see it all. Two days passed and it was night time, I was sitting in my favorite chair watching TV and looking at the tree when I saw a silhouette on the wall behind the tree. I turned around to see what our son was doing but no one was there, I was alone in the room yet I swear I saw a shadow, a silhouette of a little head on the wall. For a moment I was at peace, and I walked over to the tree and called out his name so softly and tenderly as only a loving mother can.
I often stare at that spot on the wall hoping I will see the shadow again but haven't yet but I know he's still around and will show himself to me again. I know he's safe because I know he's with my mother, I sensed her in our room the night Jeremy was called to heaven, I could smell her sent all around me but I didn't understand why she had come because I didn't know he had gone till a few days later.
I have tried everything and thought of every explanation I could to explain the shadow but there is nothing that would be able to answer or explain what I saw but having our angel visit us.