Should Shining Armor still call his sister Twiley?

[cuteycindyhoney 13,307]

Yes, Shining Armor should still call his beloved kid sister Twily. She seems to like it, so why would it be a problem? My BBBFF still calls me by the nickname he used when we were growing up. Nope, I won't tell you what it is. He's the only one allowed to use it!

[Chip Circuit 1,842]

In my opinion Shining should still call his sister Twilight "Twiley", even though she's a princess, it is still a term of endearment for his younger sister. Let alone he's a prince now so he is of similar standing but seeing how the royalty of Equestria is predominantly female we can assume the society of Equestria is ruled via matriarchy, so shining would still be below here in position but still close. 

 

On a final note I for one think as long as the princess approves you can call her whatever you please. For example I don't see Celestia approving of any recognition that doesn't identify her standing, so majesty, highness, princess Celestia. Luna however would seem the one who would prefer others to just call her that, Luna instead of having ponies groveling before her.

[MLPFanatic34 3,234]

I think Shining Armor should still call Twilight Twiley, it's a cute nickname and it means they're close as siblings and care for each other.