This article explores English immersion as a type of family language policy in the Spanish region of Castilla-La Mancha. Although the field of family language policy (FLP) has exponentially grown in the last decade to include a range of multilingual contexts across the world, the policies regarding the use of English in monolingual Spanish households have received little attention. Due to the global spread of English, Spanish families invest in their children’s language education by maximizing opportunities for exposure to English inside and outside the home. This sociolinguistic ethnography of a group of 15 monolingual Spanish families with no to advanced English proficiency explores the interplay of English language ideologies, language socialization practices, and emotional investments in narratives of language experiences. This article discusses the enactment of agency among these families to sustain English immersion, which is driven by families’ English learning trajectories, professional development identities, and affective stances shaping lived experiences with English. Two main research questions organize this article: (1) How do Spanish families envision, manage, and implement English immersion practices? (2) How do these English immersion policies shape the sociolinguistic order at home and beyond for their children? Based on the findings provided by narratives of language experiences among these families, this study addresses the tensions and dilemmas related to English immersion in the field of family language policy.