So as of now my theory is that the twins are both not of the emperor's bloodline (though whether they're replacements or just the children of another man, I'm not sure.)
In chapter 1, she says that she needs to leave before the king finds out she's not his real daughter, right after reading about the descent from the goddess stuff (so presumably she's talking about her body and not just her reincarnated mind. ) She also says her brother is crown prince (and thus heir to the throne) even though she's the older twin.
Now in this chapter the saintess says the heir is false. There's a picture of Shaylia, but she's not the heir, so they're actually talking about her brother (though as his twin Shaylia is of course implicated as well.)
Also she says that Eclette is only "technically" her cousin. The technicality, I think, is that Shaylia is the legal, but secretly not biological, daughter of the emperor and Eclette is secretly the biological daughter of his older brother, the former emperor.
In chapter 1, she says that she needs to leave before the king finds out she's not his real daughter, right after reading about the descent from the goddess stuff (so presumably she's talking about her body and not just her reincarnated mind. ) She also says her brother is crown prince (and thus heir to the throne) even though she's the older twin.
Now in this chapter the saintess says the heir is false. There's a picture of Shaylia, but she's not the heir, so they're actually talking about her brother (though as his twin Shaylia is of course implicated as well.)
Also she says that Eclette is only "technically" her cousin. The technicality, I think, is that Shaylia is the legal, but secretly not biological, daughter of the emperor and Eclette is secretly the biological daughter of his older brother, the former emperor.