With people as photography object and lenses like you have, 6D all the way. You'll be surprised what 50 and 24-70 does on correct sensor size for kids, family photography. If not the bulk, I would choose 6D over any crop sensor camera.
Hey, just more evidence that we all have different ideas. I use full frame, aps-h, & aps-c. I don't have any use for a 24-70 on any of them.