Given the importance of foreign language textbooks’ cultural conceptualizations in constructing learners’ knowledge of and attitudes towards other people and cultures, the present chapter analyzed Tunisian EFL textbooks’ conceptualizations of the British family in authentic texts produced by British writers about issues in their own culture. The analysis adopted Cultural Linguistics as a theoretical and analytical framework to examine the conceptualization of the British family’s structure, roles, and relationships through cultural schemas and cultural categories embedded in lexical grammatical structures associated with family. The analysis revealed the identification of schemas such as FAMILY AS POWER AND CONTROL, FAMILY AS SUPPORT, PETS AS FAMILY MEMBERS, and SHARED ROLES. The study highlighted the important role that textbooks play as mediators of cultural conceptualizations that influence and shape learners’ conceptualizations of aspects of other cultures and of their own.