That's the thing I hate about these "new" Tomb Raiders.
Anniversary, Legend etc have completely rewritten Lara's history.
I assumed this was to sync up the game with those <expletive> movies.
Original version:
Plane crash, happened when Lara was 19 (on her way to a skiing vacation). She was the only survivor.
When Lara started Tomb Raiding, her parents disowned her, although she remained on good terms with her aunt (in spite of the savage corgi).
When Lara was assumed deceased, her parents (both of them, still alive) attended the memorial service.
And as for Natla, what the heck?
She wasn't some goddess who could turn into a flaming winged monster. She was just a very smart woman who had a lot of scientific knowledge from the most advanced civilization that ever existed on this planet.
Although it's not stated directly, I always assumed Natla used clones to "take the heat off her" from Lara, making her escape after activating the Pyramid.