This paper aims to identify how Taiwanese and Mandarin (the two dominant languages in Taiwan) are used as interactional resources by Vietnamese female spouses in bilingual Taiwanese families. Three Vietnamese-Taiwanese transnational families (a total of seventeen people) participated in the research, and mealtime talks among the Vietnamese wives and their Taiwanese family members were audio-/video-recorded. Conversation analysis (CA) was adopted to analyse the seven hours of data collected. It was found that the Vietnamese participants orient to Taiwanese and Mandarin as salient resources in admonishment sequences. Specifically, it was identified that the two languages serve as contextualisation cues and framing devices in the Vietnamese participants' self-initiated admonishment sequences.