By the time Mark Twain got married, he was rich and famous. He and Olivia (Livy) loved each other deeply.
Her nickname for him was Youth. Their only son died young. However, they found joy in their three daughters: Susy, Clara, and Jean. But despite a writing career that made him world famous, Twain had money problems for many years. When those were finally settled, family tragedies marked his later years.