"The nation of Kosovo is in the hearts of the entire Biden family," the president said with his son Beau Biden's children just off camera.
The far-right radio host has also said two recent deaths connected to NBA stars were part of a Satanic plot.
"Beautiful Things" will be released on April 6, and chronicles the president's son's struggles with addiction.
"In our family, the values we share, the character we strive for, the way we view the world—it all comes from home, from Delaware."
"Biden makes last minute trip to cemetery to rally up deceased voters," wrote one Trump supporter, mocking Joe and Jill Biden as they visited deceased relatives Friday in Wilmington, Delaware.
"What I saw was someone still wracked by his own grief & yet remarkably able to feel, I mean really feel, that of others," Alan Townsend tweeted Wednesday evening.
Beau, the former vice president's oldest son who was touted as a future Democratic leader, died in 2015 from a brain tumour.
The ad depicts Biden as an individual who has been "shaped by both tragedy and love."
In his tweet, Steve Guest, the Rapid Response Director of the Republican National Committee, wrote, "Hey Joe Biden, are you still a Redskins fan?"
Biden, 76, had three children with his first wife Neila Hunter and one with his second wife, Jill Biden.
If not for this disease, our present might have looked very different.
Joe Biden appears to refute Maureen Dowd.
In a moving interview, the vice president suggests he isn't emotionally ready to run for president.
Condolences pour in on social media while the White House creates an "In Memory of Beau Biden" page.
Beau Biden had been battling brain cancer.