Simplify the following text for a Grade 13 native English-speaking person.
Original: Livingstone and his current partner Emma Beal , also his office manager , have a son , Thomas , born 14 December 2002 at the University College Hospital , London , and a daughter , Mia , born on 20 March 2004 at the Royal Free Hospital in Hampstead .
Simplified: Livingstone and Emma Beal , also his office manager , have a son , Thomas , born 14 December 2002 at the University College Hospital , London , and a daughter , Mia , born on 20 March 2004 at the Royal Free Hospital in Hampstead .