Mishap sometimes photographs don't lie. My parents had a bitter divorce when the three of us were 4, 5, and 6 years old. (I'm the middle child, so I was 5). In the photos of us with my "father", there we are all in our Sunday best, scrubbed and beautifully dressed (in the photo I am thinking of, my sister and I are wearing matching smocked dresses) - my body language as I try to avoid my dad putting his arm around me is very interesting.
In earlier photographs, when my parents were not yet married, my dad appears to be totally besotted with my mother, arms around her waist as he stands behind her. It was all fake as he had endless affairs which continued once they were married.