I’m so glad the Doctor is now asking the question as well.

I have my own theories about the Doctor’s past, the past that the Doctor remembers.
Many believed Claire Bloom was the Doctor’s mother, but I wonder if she wasn’t the Doctor’s father. Perhaps I should say the Time Lord the Doctor believed to be his father. In that incarnation, she was referred to as an angel covering her face in shame. Her posture was similiar to that of a Weeping Angel.

Is that what happens to certain Time Lords; shamed, disgraced, and cut off from the Time Vortex? Do they become Weeping Angels?

As for the Doctor’s mother, the Doctor has said he’s vague on the concept of motherhood. (The Doctor was David Tennant as the time.) He’s also said he was half-human. (The Doctor was Paul McGann at the time.)

The Doctor has also said she has seven grans, the fifth was her favorite, even if the fifth thought the second was a Zygon. (The Doctor was Jodie Whittaker at the time.) I would love to see more of that, even if it’s in a flashback, what with the ruined Gallifrey, but to return to the Doctor’s mother (who might have no relation to the seven grans).

What if the Doctor believed their mother was from Earth? What if the Doctor’s reasons for first coming to Earth (that they can remember) was to find their mother, a human woman they never knew? What if the Doctor was still looking for her, even as they find and connect with many other humans? (This may be why Adelaide Brook, her daughter, and granddaughter touched him in a very personal way in The Waters of Mars.)

The Doctor’s past was revealed to be a lie, but the Doctor’s memories may still feel real to the Doctor. Where did the lies come from? How much truth is symbolically hidden within them? How will the truth continue to bleed through the lies the Doctor thought were the truth?

I hope future episodes of Doctor Who will explore further the Doctor’s memories; the one he has and the ones which were lost. I’m looking forward to what the upcoming episodes will explore.