The World Anti-Slavery Convention of 1840 transformed the Ashurst family’s reform networks into a truly transatlantic movement, connecting British activists with American abolitionists and reformers. William H. Ashurst’s principled defense of women delegates, despite the Convention’s refusal to seat them, demonstrated the family’s commitment to universal principles over cultural traditions. These London meetings fostered crucial friendships with American activists including Lucretia Mott, Elizabeth Neall, and William Lloyd Garrison, establishing correspondence networks that sustained transnational reform efforts for decades. The Ashurst family’s distinctive approach—challenging systemic injustices while working within middle-class social structures—proved invaluable in campaigns against slavery and later reform movements. The chapter examines how the family blended domestic hospitality with political purpose at their Muswell Hill home, creating spaces where radical ideas flourished within respectable settings. It further explores the marriages of three Ashurst siblings (Emilie to Sidney Hawkes, Caroline to James Stansfeld, and William Jr. to Bessie Ogle), highlighting how these unions reinforced family values of equality and civic engagement. Through sustained correspondence, social networking, and strategic marriages, the Ashursts established an influential model of family-based campaigning that combined legal expertise with extensive social connections to advance progressive causes across national boundaries.