I like this analogy - sparring with each other like toddlers do, before realizing that they have a lot in common as they age, like the English language, industrialization, the systemic abuse of natives, Big Oil, the World Wars and racism.
Now that they're older, they're sparring once again, just like siblings do over the parents' estate.
This is terrible analogy. We're more like neighbours, and US is a bully. We made a decision not to have much a fence before we were friendly neighbours. We regret that decision, and are planting a hedge and reaching out to our other "neighbours" for support.
The whole neighbourhood thinks you're assholes and bullies, we're all scared. But that is bring us closer together as result, so there's some upside.
Racism? Oh man, visit any other country that is more homogenous.... lol. Everything is relative.
I like your analogy, and want to add a sad addendum: parental illness and death is frequently the cause of sibling estrangement. Let’s hope this isn’t prolonged.