MashGet

BEIJING – By the standards of some other presidential siblings, Mark Obama Ndesandjo – the US president’s half brother who lives in China – is a positive boon.

Normally he keeps himself very quietly to himself in the southern Chinese boomtown of Shenzhen where he lives with his Chinese wife, practicing calligraphy and teaching piano to orphans.

On Wednesday, though, he emerged briefly to promote a semi-autobiographical book he has published which he says draws on his childhood with an abusive father – who was President Barack Obama’s father, too.