I think that's a cool UFO photo. Until you come out and say it's a hoax I'm gonna believe it. No harm in getting off that fence now and then.
Well done your sis for spotting it. I don't think the distortions around it prove that it's been photo-shopped at all. There are distortions
around everything in a photo when you pull it up close.
Keep looking up folks, you're missing stuff. UFOs are not as rare as most folk think.