How to measure how far apart we are.

Recently, my son offered to share the lone paint brush we could locate in our messy kitchen/craft space. In fact, I'm pretty sure, for him, it was the more ideal option.  He was not opposed to hand over hand painting. To be subsumed is closeness for him. Let's do this together, as close as humanly possible. My daughter wants to do most things separately--apart. She wants to be admired, adored from a slight distance. Both of them want to be close  but the terms of measuring distance are different.  One measures the distance in molecules, the other in dimensions.