I secretly replace one family photo every Christmas

My parents have a hallway with twenty framed photos. Four years ago I replaced one childhood picture of myself with a recreation: same sweater, same pose, but fifteen years older. Nobody noticed. Now I do one each Christmas. Last year my brother recreated a beach photo in his bathroom using a blue towel and desk lamp. Mom dusts the frames alot and has never said anything. There are six fake childhood photos in that hallway. I’m no longer sure whether the joke is on my parents, or on two adults spending November hunting for discontinued wallpaper. We shoot number seven tommorow.