As Ferdinand Marcos Jnr touches down in Washington this weekend, his mind may well be half a world away, fixed not on the security and trade talks that await him but on the family feud back home: one born of betrayal, blind ambition and the wounds of history.The 67-year-old Philippine president – known to many as “Bongbong” – and his sister Senator Imee Marcos, 69, were once the very picture of sibling solidarity, but have now become estranged, their rift laid bare for all to see.Imee has...