Addice and Peter Thomas, passionate collectors of American and English antiques, amassed a vast collection over their 60-year marriage. Both were active members of the Washington, D.C. arts community. Peter served as Dean of the Corcoran School of Art and later as Art Director at the Federal Reserve Board of Governors. Addice studied voice and worked for two decades as the manager of the Washington Opera at the Kennedy Center.

As collectors, their focus was primarily on the 18th and 19th centuries, though they occasionally acquired from earlier periods. They frequently sourced their antiques at shops along the East Coast and during their annual trips to the United Kingdom.

Their collection is incredibly diverse, encompassing a wide range of items from art, folk art, and decorative arts to sterling silver, tinware, blue granite, pewter, copper, and brass. Their collection of English ceramics including ironstone, early Mason’s wares, Gaudy Welsh, Gaudy Dutch, and Staffordshire, numbered in the hundreds. Additionally, they acquired over one hundred Staffordshire figures and child's dishes, Toby jugs, and Dutch ceramics including a striking five-vase garniture. Finally, they had a substantial collection of American and English furniture, child’s furniture, and over fifty Persian carpets. Their collection was a testament to their passion for antiques and dedication to building a truly unique collection.