Anti, Metratone, you're proving a simple point, that Jason isn't perfect, which I'm glad people see.
He's blinded by his own emotion, and let his love for Dahnai overrule his logic. He forgot that Dahnai isn't just a woman he loves, she's the Empress of a warlike and highly aggressive race, who once told him that Faey could not help themselves when it came to making war on themselves and others. Now she's pregnant with his daughter, and he's in one hell of a righteous mess.
Can he tell her? How much can he tell her if he does? Does he reveal Cybi? How does he make her understand just how precious Raisha is without telling her more than she needs to know, and yet impress upon her just how important she really is?
And what of Raisha? Do they leave her to Dahnai and allow her to be raised as a Merrane, with no knowledge of just who and what she is? Do they demand to be given Raisha, to be surrendered to the Karinnes, when a man has absolutely no right to his child when sired out of marriage, and thereby make the Siann go up in flames when a Grand Duke makes outrageous demands of the Empress?
And what of the fact that she IS an Imperial princess? Wouldn't she be of tremendous use to Karinne by being in the Imperial house?
There are so many issues here that it'll be hard for them to wade through it all and make the best choice.
What you can be sure of is no matter what's ultimately decided, it won't be the right answer. There is no right answer in this situation, there is only the answer which causes the least amount of damage. Because no matter what happens, someone's going to be pissed, be it Jason, Dahnai, the Siann, or all of them together.
I can give you at least a little bit of a spoiler and tell you that Jason, Cybi, and Miaari decide that, no matter what, Dahnai needs to be told at least SOME of what's going on, a small portion of the truth, so she better understands what the Consortium is after, and also so she more fully appreciates just how much danger she will put both herself and the Imperium in if she decides to keep Raisha on Draconis. For when the Consortium finds out Jason has a daughter on Draconis, they WILL come after her.
Guess it would be even more of a spoiler to slip a little and say that Raisha wasn't a natural conception. There's a reason she's one of a pair of fraternal twins, with Kellin being the other father.
Dahnai is a schemer. She's never pretended to be anything different, though she'll deny it up and down if accused of it.
Just another guy from the shallow end of the gene pool.