I feel your pain....I struggled with this for years and finally had a light-bulb moment when ds, said..."Mom, I'm just not a morning person." I reluctantly...very reluctantly gave up my ideal schedule of both completing instructional time by lunch. Then they were working pretty much independently in the afternoon while I was free to cook, clean, run errands, and basically have some me time.
Mine both work better and prefer not to work in the same room. Different work areas helped a bunch when they were younger. My high schooler has a much longer day than her brother, so our current routine works for all of us. Her brother isn't disrupting her concentration. I do miss having my afternoon kind of free if neither needed homework help.:tongue_smilie: