With summer comes more together time for kids, even my 3 busy teens. I get to see the (mostly) good and (occasional) bad & ugly of this on a daily basis, but one thing that strikes me is how seeing sibling closeness in action becomes even more powerful and gratifying as they--and I-- get older and they inch ever closer to independent adult life. Because we can't live forever, knowing our kids will be there for each other is at the top of a parent's wish list, or at least mine. Some of this is out of our control (see that "independent life" part), but the basic patterns of caring for each other can be nurtured in sibs, starting very young.
Here's a nice post from vlogger/social media consultant Danielle Smith on how she uses one key question to nudge her kids into respecting, protecting & encouraging each other: "Am I being kind?"