https://www.dailymail.co.uk/news/article-13971075/What-Biden-Obama-said-intense-moment-Ethel-Kennedys-funeral.html
They were seen having an intense conversation and, according to a lipreader, Biden said 'She's not as strong as me' before Obama replied 'That's true.'
Obama then said to Biden: 'No that's not on' - to which Biden responded: 'Hmm.'
The former president added: 'I think it's important that we can have some time together, we'll take it at value.'
Biden appeared to back his predecessor up, saying: 'Yeah, we'll get there in time.'
Obama then turned away from the camera and said something else to Biden, to which the president responded: 'Uh huh.'
The conversation at the funeral was then interrupted by Bill Clinton who looked over at them and gestured toward the front of the cathedral.