The Warlock by Michael Scott (2011) Delacorte Press

Further adventures of Nicholas Flamel – in this volume there are many of the Elders and Immortals who want to control the Twins of Legend.  10,000 years ago in Danu Talis, Aten is the ruler and Bastet, his mother wants her other son, Anubis to rule all of creation.  To do this, they want to eradicate all humans.  Aten wants humans to be treated as equals, so Anubis declares him a traitor, a warlock, and has him thrown into prison awaiting his trial and to be thrown into a volcano.  In the meantime, the twins find themselves on different sides, but when Dr. John Dee creates a new leygate, both follow and find themselves in that 10,000 year ago time.  And they have company.  Dee grovels and apologizes to his masters, Osiris and Isis, and the twins look at them and say, Mom?  Dad?