Arani Korden said:
Been wondering something, chief. Just how is Arani related to House Cadriaan? It's the sort of thing that I imagine will come up in conversation once we get out into polite society.
My current working assumption is that Arani's father is Tapani, and a member (however distant) of the house. There seems to be some linguistic relationship between Korden and Cadriaan. By that assumption, Arani's mother is Naboo, and a relative bigwig - probably an advisor to the throne or something. From what I can gather, the Naboo nobility seems to be more of a "working" nobility (and elected in places, as well), which is why Arani was raised on Naboo.
But I don't know how well any of this fits into your plans, and I don't want to say something onscreen that needs to be fixed.
Lady Agatha is Arani's Great Aunt on her mother's side. Her mother's father's sister, to be precise. So while directly related, the relation is distant.
Your mother would be considered a Noble of sorts in Tapani, perhaps even as a Lady of Cadriaan, if she decided to push it. Arani's claim to Cadriaan nobility would be a little more tenuous. Of all the Tapani Houses, however, Cadriaan has been the least concerned with pedigrees and lines of succession amongst its nobles, so long as they can provide useful services or resources to the House.
And since Wizards never elaborated...
Arani's mother, being quite far down the line of succession, was originally sent to Coruscant to strengthen ties between House Cadriaan and the Republican Government as an attache for the Cadriaan Ambassador to Coruscant. There, she met your father who, at the time, was a liaison for Senator Palpatine from Naboo. They eventually married and moved back to Naboo, where they both climbed the bureaucratic ladder, becoming modestly important functionaries in the Naboo Democratic Monarchy.
Thus far I've stuck to "Your Great Aunt", "Aunt Agatha", "Lady Agatha", "Aggie", etc... Agatha does not yet have a surname. I'm comfortable leaving it that way, though suggestions are always welcome.