How Hunter Biden's addiction battle became a high-wire act for Joe Biden

Hunter Biden's business dealings have provided President Trump with plenty of political ammunition, while making an already complicated father-son relationship even more so.

Joseph R. Biden Jr. and his son Hunter talk every day, typically a fast check-in initiated by the Democratic presidential nominee, often from the back of a car between campaign stops. Although Mr. Biden tries to touch base with his two grown children and five grandchildren once a day, doling out “I love yous,” Hunter is a special case.

“My only surviving son,” is how the former vice president refers to his “Hunt,” whose battles with addiction have made for a long-running high-wire act within the Biden universe.

The stresses of Mr. Biden’s presidential campaign have made an already complicated father-son relationship