You noticed? The dear little thing never moved a muscle when they moved it. Now look at the original photo where zero is sitting on the arm of the chair with his mother. Look at the angle of the arm, then look at the angle of the arm on the couch, and how it’s been drawn in by hand.
What you are looking at in that group image is TWO CHAIRS - one with the man sitting in it, the other that SAD was sitting in, now joined to look like a couch with the rest added. It takes a while, and it’s fascinating in what that tells you.
They never had a single image of the ‘family’ together, they had to make one.
Like you said, it’s a magical baby!