Mary Adams (1776-1865) was the daughter of Colonel John Llewelyn of Penllergaer, Llangyfelach. In 1807 she married Lewis Weston Dillwyn (1778–1855), a British porcelain manufacturer, naturalist and Member of Parliament. Together they had six children, including the noted photographer John Dillwyn Llewelyn (1810–1882), MP for Swansea Lewis Llewelyn Dillwyn (1814-1892) and pioneering female photographer Mary Dillwyn (1816-1906).