In Reply To #17
If Sonia is in the timeline, and she's a belmont, who else would be Trevor's mother? Not to mention that in Sonia's ending it mentions her having an heir to combat Dracula when he returns or something like that.
Of course if she isn't in the timeline, then it doesn't matter who his mother is, because she isn't even in the timeline, so there was no mention of his mother period. For all you know, Trevor's mother could be a woman named Sonia.