Amnesia: Justine Discussion Topic

[Paisley Palace]

Finally got around to playing through Justine, and I noticed something interesting in the crypt at the end that I haven't seen anybody else touch on here or otherwise. On the opposite side of the chamber from the angel statue (and, presumably, the mother's grave) is a headstone that when touched gives this message:

Spoiler below!

My question is who is this mysterious brother, and why do we hear nothing about him? Did he die at birth or shortly thereafter and thus didn't really merit mention? (I'm guessing it could be his grave.) I thought Justine's mother succumbed to an illness... so perhaps this could be someone else entirely.

Justine's sounds also become strangely masculine while she is in this room, and it only wears off when the player exits the room. There is a clear shift up the vocal register as the effect wears off.

Any theories? Explanations?

Although a little far-fetched, Justine may have actually been born a male, and at an early age her father reinforced the idea that Justine was a girl, not a boy. It is hinted in the game that Justine was sexually abused by her father and therefore convincing her she was a girl for that purpose...? But, she does appear rather feminine in her portraits, and the fact she had three men ready to marry her kinda convinces me she was born and raised a girl. But I wouldn't rule my idea out..

And don't forget the fact that Justine is a girl's name and she sounds girly.

I feel like something as simple as a name wouldn't be a huge deal as far as gender changes go. But like I said, the idea is pretty far-fetched.