Why isn't Joe Biden's secret granddaughter welcome in the White ...

Is President Joe Biden up to the job or not?

Does he have the mental capacity to lead the free world for another four years? 

White House insiders report his family is in no doubt, with son Hunter leading the charge, rallying his 81-year-old father to keep going to defeat Donald Trump. 

But should the president be taking advice from someone whose life for the past decade is best described as a train wreck? 

Hunter Biden is a former crack cocaine addict, currently facing the possibility of prison over tax charges and a firearm conviction. 

Less well-known, though equally a mark of the man, is that Hunter is also the father of a five-year-old girl from Arkansas named Navy Joan - a fact that until recently he fought very hard to deny. 

Speaking to 60 Minutes, Navy's mother revealed the difficulties she encountered dealing with Hunter Biden, as well as her hope her bubbly daughter might one day be welcomed into the wider Biden clan.

Watch the full story on 9Now.