Orion Clemens was born on 1825-10-06.

Orion Clemens died on 1897-12-11.

Samuel L Clemens had six siblings 1. ORION CLEMENS 2. PAMELA ANN CLEMENS 3.PLEASANT HANNIBAL CLEMENS 4. MARGARET LAMPTON CLEMENS 5. BENJAMIN LAMPTON CLEMENS (Here is Samuel Clemens) 6.HENRY CLEMENS Samuel L Clemens had six siblings: 1. ORION CLEMENS 2. PAMELA ANN CLEMENS 3. PLEASANT HANNIBAL CLEMENS 4. MARGARET LAMPTON CLEMENS 5. BENJAMIN LAMPTON CLEMENS (Here is Samuel L Clemens 6. HENRY CLEMENS

Orion Clemens is best known for assisting his younger brother, Mark Twain (Samuel Clemens), in various projects, including helping to run a publishing company and in editing some of Twain's works. Orion himself wrote a few works, but is primarily remembered for his support of Twain's literary career.

Yes, Samuel Clemens had six siblings, three brothers and three sisters. His brothers were Orion, Henry, and Pleasant, while his sisters were Pamela, Margaret, and Benjamin.