One of the items on the boy's Christmas list was a pulley for the outdoor playhouse. My brother, who has a machine shop, actually made them a pulley, a beautiful wood pulley from mahogany and walnut and climbing ropes. It might be too beautiful for the playhouse. Before giving them the pulley, my brother asked me,
"Are you sure you want them to have a pulley? I can imagine Noah lifting Mattias into the air with this thing."
If you remember simple machines from physics, a pulley reduces the effort needed to lift an item. My brother's device has four pulleys, which, I THINK, means the effort to lift something is one-quarter that which would otherwise be required.
So, yes, they could lift each other.
And now that I've seen the beautifully crafted pulley that my brother made, I'm having some second thoughts about letting the boys use the pulley. Hmm.