Series I. Family Papers contains materials related to the Briggs family. This includes a collection of letters, primarily written by Sarah Elizabeth Cobb Briggs to members of the Briggs and Cobb families. She wrote most frequently to her mother-in-law, Mrs. Sophia Briggs, and to her brother, William Cobb. Most of Sarah's letters were written aboard the ship, giving the impression that she frequently accompanied her husband to sea. There is also correspondence from Briggs himself to his son, mother, and brother-in-law. The content of these letters is largely of personal news and family matters. This series also contains a photograph of Briggs, his father Captain Nathan Briggs, and his son Arthur S. Briggs. There is also a tintype of Briggs' daughter Sophia Matilda Briggs. Also within the miscellaneous family papers is a wedding card from Benjamin and Sarah's wedding, a receipt from the sale of their estate, and receipts from Arthur S. Briggs.