@Background Pony #6071
And when she has two living parents, an older brother in his teenage years, and
Celestia, there's nothing
fair whatsoever about Twilight being the primary caretaker of Spike from the get-go. The former four (especially the adults) can't look anything but bad if they pressured her to do this as a freshly cutie marked kid, or even a teenager. Sure, she certainly became his caretaker when she moved out on her own before S1, as a high-school/college graduate, and they were quite close, but still.
It's a shame we didn't get more with Shining Armor and Spike; he could've been one to influence him on his desire to be a "knight in shining armor" at some stage of his life (specifically, one example is in A Dog and Pony Show). …it's a shame we didn't get more Shining Armor and Cadance in general, because the crumbs we did get were interesting enough. @Myoozik
Not sure I'd want to know, but curiosity is such a damned thing that I probably wouldn't say no to learning it.