Yay, we're almost back to Twilight!

Nice backstory for Twilight being an only child.

It is actually big brother best friend forever

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Sorry, slightly autistic when it comes to acronyms

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Where all slightly autistic in one way or another, it's nothing to be ashamed of.

I actually find SA visually credible to b Twilight's brother and not just becuz of them both having manes and tails streaked with multiple colors

Shining Armor takes after Twilight Velvet in having a white coat even tho hers is a pale gray while the blues of his mane and tail come from his dad whereas the streaks are sorta similar to Velvet's

Twilight on the other hoof sorta takes after her father Night Light. Yes, he's blue but his daughter's coat and mane give a similar impression while Twilight's purple colors likely come from the purple in her mother's mane and tail while also inheriting the streaks trait as well

The traits are subtle yet distinctive enough to at the very least find them all being related as believable

Neither of them inherited Night Light's yellow eyes and where could Twilight have gotten the streak of magenta in her mane? The answer? From grandparents or even other close relatives. SA mentioned having a favorite uncle whose badge he wore in his wedding. Sure we never saw this uncle or any other relatives for that matter, but that doesn't mean they don't exist. Genetics are weird and can't always be taken seriously, like how traits can skip a generation or two, or manifest in other ways