Charles Adams was the son of President John Adams and the brother of President John Quincy Adams. He lived a short tragic life. While young, he traveled in Europe. He later went to Harvard and became a lawyer. He married and had two daughters. However, he was a chronic alcoholic and he died from this condition at 30.
The John Adams series on HBO dealt with this on the most recent episode. It showed Charles in a drunken stupor begging his father for forgiveness as John Adams disowned him. It also showed Abigail Adams visiting her sick son begging him to "come back to us."
The final scene dealing with Charles Adams is when his parents receive word that he has died. Abigail is shown as being shaken by the news but President Adams is unmoved. Instead, he said, "I still will not forgive him."
This made me very curious about Charles Adams. There is not a lot on the Web about him. I hit some books dealing with John Adams and learned more. Charles is not covered in detail in any of them but glimpses of his childhood, his time in Europe, his relationship with his family, and his dying days do come through.
I found a letter from John Adams on the topic of the death of Charles Adams in John Adams: A Biography in His Own Words (1973) which was edited by James Bishop Peabody. President Adams had written a letter to his friend Adriaan Van der Kemp on December 28th, 1800. He wrote, "The affliction in my family from the melancholy death of a once beloved son, has been very great, and has required the consolation of religion, as well as philosophy, to enable to support us. The prospects of that unfortunate youth were very pleasing and promising, but have been cut off."
It is easy to see that President Adams was dealing with both grief for his son as well as his anger towards him too. 1800 was a tough year for John Adams. He lost the Presidency to Thomas Jefferson and he lost a son as well. The manner of his son's death made it even harder to take. I do not know if there is enough source material out there but a biography of Charles Adams would certainly be interesting. I hope someone writes one someday.