Spoilers for... I don't know when. Just don't read them if you have not finished the game.
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THE
YU WIKIPEDIA ENTRY SAYS SOMETHING INTERESTING INVOLVING AEGINA AND LUCIANA.
It says that Aegina's full name is アイギナ=アイネ=アルトワルツ and Luciana's full name is ルシエナ=ルーン=アルトワルツ.
I don't know how I would translate the middle parts, and I'm not interested in making myself look stupid with my lack of experience, so I'll leave that to Rai.
But if that information is true, then that would mean Aegina and Luciana are also related to Yggdra. I don't think that should be surprising. They DO look really similar... But I don't ever remember this being said in the actual game! I know it said Yggdra's full name, but I don't recall seeing anything else after that. And this is the kind of stuff I look for in the dialogue, because I can actually read it. :(