This series has been arranged to group files together which relate to individual children and their immediate families where possible, or within a single sub-series for content which relates to or originates from multiple children. The files within the sub-series reflect the original groupings made by the family prior to the deposit of the papers at Newcastle University. The sub-series are as follows:
- CPT/4/1 - Letters relating to various Trevelyan children
- CPT/4/2 - Letters relating to Pauline Dower, nee Trevelyan and family
- CPT/4/3 - Letters relating to George Lowthian Trevelyan and family
- CPT/4/4 - Letters relating to Katharine Trevelyan [Kitty] nee Gotsch nee Trevelyan and her family
- CPT/4/5 - Letters relating to Marjorie Weaver nee Trevelyan and her family
- CPT/4/6 - Letters relating to Florence Patricia Jennings [Patricia] nee Cheswright nee Trevelyan and her family
- CPT/4/7 - Letters relating to Geoffrey Washington Trevelyan and his family