Talk:Limestone Pie and Marble Pie/@comment-1416077-20151103182934/@comment-5837525-20151103214635

"the content of the show says otherwise"

The "content of the show" implies nothing beyond what's stated. Pinkie specifically refers to Marble as her "baby sister". They are not referred to as twins, so as far as the Wiki is concerned, they are not treated as twins. Anything else inferred on the part of the individual is strictly headcanon at that point.