Alien Encounter in Monona, Wisconsin on March 17th 2016 – Grey like entity seen sneaking past in room reflection while back turned.

3 to 4 ft. tall grey like creature with pointed ears, large black eyes, small mouth and nose, in blue one piece suit with long fingers, likely less than 5. Creature was witnessed in reflection of room while back was turned apparently sneaking from hiding to staircase. Appears to have entered and left house by dematerialization or portal of some kind. I was alone in room, seeing mother out to car, father was asleep in another room. Creature vanished after that leaving no trace.