Little girl on the left has some unknown little person's hand around her, or she's growing a 3rd hand on her shoulder!
the hand on the child
photoshop error - three picture have been joined together! You can never get all the kids smilling at once so it is now very common to merj/photoshop pictures together to get the "family portrate" - the give-a-way is the swinging chair; for the Mom & Dad the chair slats are facing the camera front on. for the children they angle off like the camera has changed angle.
Didnt notice the 3rd arm till someone mentioned it. I was more worried about the baby. Its body is facing forward while her legs and 180 degrees turned around.