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Goodbye guys ;)
[@Eragor14](/images/3118270#comment_10528047)
They were both [designated](https://www.equestriadaily.com/2012/05/happy-birthday-pinkie-pie.html) [selectively](/images/2858285#comment_10080441) a while ago. :)
[The writer of *Hearthbreakers* also testified to their birthdays here: "@FaustXXXVII it comes down to your definition of twins for non-humans, e.g., to me, puppy litter = siblings not twins."](https://twitter.com/nickconfalone/status/658016670020014080) [And here he said: "@FaustXXXVII Marble/Pinkie not identical twins, if they were I'd call them twins. But they're not, so how about "sametime sisters!"](https://twitter.com/nickconfalone/status/658017122103103488) Both retrieved from [here](https://mlp.fandom.com/wiki/Limestone_Pie_and_Marble_Pie#cite_note-4).
Marble is technically a few minutes younger than Pinkie, but I think it's close enough. :)
Additionally, based on *The Elements of Harmony Vol. II guidebook*,
Limestone Pie is Pinkie Pie's oldest sister, and the family business is her passion. She isn't afraid to speak her mind if she must, while Marble is Pinkie Pie's baby sister and the demure pony of the family. She prefers to let her older siblings do all the talking.
They were both [designated](https://www.equestriadaily.com/2012/05/happy-birthday-pinkie-pie.html) [selectively](/images/2858285#comment_10080441) a while ago. :)
[The writer of *Hearthbreakers* also testified to their birthdays here: "@FaustXXXVII it comes down to your definition of twins for non-humans, e.g., to me, puppy litter = siblings not twins."](https://twitter.com/nickconfalone/status/658016670020014080) [And here he said: "@FaustXXXVII Marble/Pinkie not identical twins, if they were I'd call them twins. But they're not, so how about "sametime sisters!"](https://twitter.com/nickconfalone/status/658017122103103488) Both retrieved from [here](https://mlp.fandom.com/wiki/Limestone_Pie_and_Marble_Pie#cite_note-4).
Marble is technically a few minutes younger than Pinkie, but I think it's close enough. :)
Additionally, based on *The Elements of Harmony Vol. II guidebook*,
Limestone Pie is Pinkie Pie's oldest sister, and the family business is her passion. She isn't afraid to speak her mind if she must, while Marble is Pinkie Pie's baby sister and the demure pony of the family. She prefers to let her older siblings do all the talking.