Talk:Limestone Pie and Marble Pie/@comment-1416077-20151103182934/@comment-1416077-20151105224333

The problem is that the writer is saying that they were born of the same mother, at nearly the same time, from the same pregnancy, but they are not "twins" ONLY because they are not identical twins.

In other words: they are fraternal twins, as stated on-screen by Pinky's statement that Marble is her minutes-younger "baby sister".