My 6 & a half year old son and i were starring up into the night sky from our driveway. We could see the stars very clearly this night. From a north westerly direction we saw a bright white light appear quite high in the sky. It became visible to us once it got past the tree tops that line our yard. We were talking about and starring at the stars at the time so when we saw the light we initially assumed it was just a plane, and never really gave it much thought. But then i noticed that this object was moving very smoothly through the sky at quite an unusual speed. Not very fast, but not as slow as a low flying plane either. It appeared to 'glide' through the air. That's when i also noticed that it was making no sound at all. None! I immediately paid even more attention to it as it had moved about 5 blocks in distance, well above our heads. It was moving in a straight line and had passed over our heads and was heading toward the Okanagan lake. Just at that moment an actual airplane had appeared from behind the tree tops on the other side of our yard. We could immediately tell it was a plane from its flashing red/green/white lights, and it made a very distinguishable airplane engine sound. It was flying a fair bit lower than the bright white light. And just as the airplane and bright white light (UFO) were directly in line with each other (the UFO appeared to be a fair bit higher than the plane and was directly above it), the UFO swiftly changed direction and shot up into the sky at around a 75 degree angle, then disappeared in less than a second.It happened so fast i didn't put it all together in my mind until a few minutes afterward; after we had told my wife and mother-in-law about it. It was then that i fully realized what we just saw. It was a very eery feeling i had after that.