@Renny Nikolas is a Captain, not the full on commander. He's a powerful officer, but below Terryn still. As for Alycia, he loves her enough that he kept her bastardization a secret. Other than to Nikolas and his brother, everyone believes Alycia is his biological daughter. Even Sara doesn't know. However, there are rumors, rumors Sae might have heard, otherwise. None of the rumors have enough proof other than idle gossip, a curious little note, fueled mostly by the word of servants, and the daughters queerish appearance, red haired and blue-eyed. He isn't the type of man to resent a child. Alycia was born, and in the process, she killed his wife. However, he sees that as the Monarch's justice, to punish his wife for infidelity, and in return, he cares for the child she bore. It's a sort of exchange, in his mind.
As for Sara and Sae, I'm sure it'll be interesting, Sara loves interacting with nobility, their whole lifestyle completely enthralls her.