Beethoven was, by most accounts, a difficult man to be close to. He was suspicious of people’s motives, prone to falling out with friends and collaborators, and capable of treating people who cared for him with considerable sharpness. He changed publishers and patrons, fell in and out of friendship with fellow musicians, and feuded with his brothers over questions of money and family loyalty. His relationship with his nephew Karl—the son of his brother Caspar Carl, whom Beethoven effectively took custody of after Caspar’s death in 1815—was one of the most painful episodes of his later life.
The custody dispute over Karl consumed years of legal proceedings, legal costs, and emotional energy. Beethoven was convinced that Karl’s mother was an unsuitable parent and fought for years to limit her access to her own son, a campaign that involved repeated court hearings and appeals. Karl, who grew up in this contested situation, eventually attempted suicide in 1826, shooting himself in the head. He survived, but the attempt shook Beethoven deeply and contributed to the deterioration of his health in the final year of his life.
Karl van Beethoven—the nephew—recovered from his injuries and had a long life after his uncle’s death. He served in the military, married, and had children. He had complicated feelings about his uncle, by all accounts, which is understandable given the circumstances of his childhood. He did not pursue a career in music.
Beethoven’s letters to Karl, to his friends, to his patrons, and to the “Immortal Beloved”—the unknown recipient of a passionate unsent letter written in July 1812—constitute one of the richest archives of a composer’s inner life that has survived from any period. The Immortal Beloved letter was found among Beethoven’s papers after his death, along with the Heiligenstadt Testament. Its recipient has never been definitively identified; scholars have proposed multiple candidates, including Josephine Brunsvik, Antonie Brentano, and others, with different degrees of evidentiary support.