Animating a parented camera

[Lumpengnom]

Are you on Mac?
I am on mobile so i can not see much in the video but it sems to be the same problem as this:

Strange parent/child double transform when keying

I have found that trying to animate a child has a strange double transform effect when key framing. I have watched many, many parenting and rigging tutorials and have looked for forums that address the issue but have not found anything relevant. So here it is. Here is a video of the problem. https://www.youtube.com/watch?v=_f5VjDxdBUs As you can see it is a very simple parent of one cube to another. But if I rotate the parent and then keyframe the child the child jumps.