Subseries C. Family Papers incorporate the John Curwen estate papers, Margaret Thatcher estate papers, Jonathan's immediate family papers, and his in-laws' papers. The John Curwen and Margaret Thatcher estate papers contain accounts and receipts for the settlement of the estate of Jonathan's brother, John, and correspondence, funeral expenses, and accounts for Jonathan's mother-in-law, Margaret Thatcher. The bulk of the family papers includes domestic accounts for Jonathan's family. Jonathan's in-law papers contain correspondence from in-laws Sergeants and Gibbs, and letters, accounts, and receipts for Jonathan's brother-in-law, William Browne and his family.