“Doctor Who to marry Doctor Who’s daughter” is the headline in The Register:
Doctor Who the 10th, David Tennant, is planning to get hitched to his fictional daughter Georgia Moffett, who also happens to be the real daughter of his fictional fifth incarnation.
David Klaus offered to help me navigate the tangle:
An actor who played The Doctor is to wed daughter of another actor who played The Doctor.
David Tennant is to wed Georgia Moffett, whose father is Peter Davison. “Moffett” is her real name; both “Tennant” and “Davison” are stage names picked to avoid conflict with other actors who had similar names before they — Tenant and Davison — began their careers.
To further complicate matters, on Doctor Who, Georgia Moffatt portrayed Tennant’s Doctor’s genetic daughter.
I see, said the blind man. Now… “where did all you zombies come from?”