Until July 28, 2023, Joe Biden did not publicly acknowledge the existence of his seventh grandchild, who was age four at the time. Many news stories described the situation as Joe Biden "not acknowledging" his seventh grandchild (as reported by NPR) rather than "denying her existence, prior to that date in July 2023:
President Biden publicly acknowledged his seventh grandchild, a
4-year-old named Navy Joan Roberts, for the first time on Friday,
capping a month of questions about why he had seemingly excluded the
little girl from his tight family circle.
This marked a change from 28 April 2023, when Biden did not mention his 7th grandchild during a "Take Your Child to Work Day" event at the White House:
"I have six grandchildren. And I’m crazy about them. And I speak to
them every single day."
A New York Times article published on 1 July 2023, reports that
"In strategy meetings in recent years, aides have been told that the
Bidens have six, not seven, grandchildren."