Series II. Related Family Papers includes collections of correspondence, legal documents, and genealogical records of families related by marriage to the Burnham family.

Subseries A. Howes Family Papers include letters between Captain Peleg Howes, his wife, and his daughter Phebe Howes, the first wife of Everett Burnham.

Subseries B. Andrews Family Papers contain correspondence, legal documents, land purchases, and genealogical information related to the family of Sally Andrews, third wife of Captain Samuel Burnham.

Subseries C. William Moody Papers consist of a will and legal documents of William A. Moody, grandson of Samuel and Sally Burnham.

Subseries D. Genealogical Records consist of handwritten materials such as family trees, marriage records, and birth records for the Burnham, Andrews, Moody and related families.