I've watched home movies of my childhood, trying to figure out what went on (since I had no memories). The primary thing that came out of it was dad being natural, playful with us as kids, and mom trying to either orchestrate the scene or completely removed from what was going on around her. One scene, at Easter, was Mom posing with the kids lined up like little soldiers, us carefully watching her for a sign of what we should do, stiff little children. The same day, dad with the kids, all of us climbing all over him, Dad beaming and hugging us, we didn't care if our dress or suit got wrinkled, Dad didn't care either, as long as we were all loving each other.
I do see a dynamic change when my brother was born when I was 2 years old. In all the movies he was the focus. I would be standing in the background, occasionally trying to get in the picture, but would be pushed back while the adult beamed over my brother. As my brother grew, he actually became physically violent with me and would show off for the camera after he had made me cry. And the camera would be focused on him gloating while I stood tearful in the background. And as we grew and would play board games as a family, my brother would throw fits if he didn't win. And Mom would then pack up the entire game "OK, we're not playing anymore." And so the rest of us would have to give up playing just because brother threw a fit. So he controlled the family dynamic. And it got so much worse the older he got.
In adolescence I suffered a loneliness and pain that I still cry about occasionally. Our family moved out of state. I felt like everyone had someone but me. Mom had the new baby. My brothers had each other. Dad had his new job. When I was 12 I tried to commit suicide. Mom discovered me during my attempt. Other than "What are you doing?" nothing was ever said to me. Life went on as normal for the family. No one asked me why. The perfect family image was kept intact. One time when I was really having issues with my mother, I confronted her with this time in my life. She said I was very happy during that time, no problems at all. I sobbed and sobbed to my mom after telling her about this time of my life. She was an ice cube, completely in denial about my feelings, ha, that's it. My feelings do not matter. She didn't care that I was still broken up about something that happened 40 years ago. She was still protecting the perfect family image.