Celestia: “Everypony will probably just keep using whatever title they’re currently using, for sake of ease, but I suppose technically, Twilight will be both Cadance’s Sister-in-Law and Aunt-in-Law.”
Wouldn’t Cadence being Celestia’s niece mean she is Luna’s descendant? So technically this would be Twilight being Cadence’s great (to however many) grandmother-in-law wouldn’t it?
If I remember correctly, Cadance isn’t actually related to Celestia and was just adopted as a “niece.”
“Tarmarean”
Well played horse puns, Silfoe!