I think the one from Comedy of Errors might be best since brotherhood is an integral part of that play: We came into the world like brother and brother, And now let's go hand in hand, not one before another.

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I really like the use of the word affinity, that's very good. Thank you for sharing. My SO and I have our family of two where we get to define our own culture. I use a combination of Seth Godin's definition of culture: "People like us, do things like this" and Brené Brown's definition of boundaries : "what's okay and what's not okay" for our own definition: "People like us do things like this, and not like that." We are all part of many overlapping cultures. In the culture my SO and I have created, we are conscious about defining boundaries for what's okay and what's not okay. We revisit and negotiate what's okay and what's not okay often. Circumstances, context, and nuance matter. Circumstances change and boundaries may have to change as well. Toxic cultures often have harsh, inflexible rules that protect abusers, enablers, and bullies; while silencing victims. I grew up in a very toxic Midwestern culture with a very narrow view of "acceptable human". Fake niceness, " fit-in ", or else... It sucks that abusers, enablers, and bullies seem to have an affinity for each other. More on reddit.com