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p.1 #3 · p.1 #3 · Tips for shooting multiple subjects wide open?  
+1 @ Same plane.
The plane need not be parallel to the camera's film plane, but the subjects do need to be the same distance from the lens, realizing that there is both horizontal and vertical axis impacting that distance.
Mother may I take 1 step back and 3 steps to the right, can be the same distance away as 3 steps back and 1 step to the left (crude, but you get the gist). Same plane, same distance, parallel to the camera is easiest though ... think isosceles triangle instead of right triangle.
As an exercise, place two rulers in front of your lens, one pointing straight ahead, the other pointing 45 degrees away, but both starting at your lens. If your lens if focused to a the end of one ruler, the end of the other should be in focus as well as they are the same distance from the lens (lens design variable), even though their shared plane is not parallel to the film plane. The two points do share a plane together. Having them the same distance is the key.
