本研究旨在探討中年未婚子女與父母同住的代間關係。採用質性研究訪談五位年齡介於40至55歲、居住於台灣中南部的未婚子女，皆長期與父母同住超過五年。資料經逐字轉錄後，以主題分析法進行歸納與詮釋。研究結果分為三大主軸：一、孝道觀念與實踐，包括1.家庭情感依附與歸屬認同。2.當未婚且同住成為默認的照護身份3.受到父母對孝道詮釋與傳遞的影響。二、中年階段的家庭經驗，包括1.在努力與耗竭間展現韌性。2.在避戰策略中維持情緒應對與專業位置。3.跨代承擔與生活角色協調；三、與父母同住下的代間關係，包括1.情感支持與性別分工不均。2.家庭中的價值張力與角色矛盾。3.從適應、妥協到制度資源的介入修補代間議題。

This study examines intergenerational relations among middle-aged unmarried adult children co-residing with their parents in Taiwan. Using a qualitative approach, in-depth interviews were conducted with five participants aged 40 to 55, all of whom had lived with their parents for more than five years in central and southern Taiwan. Interview transcripts were analyzed through thematic analysis, and three major themes were identified. First, filial piety and its practices included (1) emotional attachment and family belonging, (2) the implicit expectation of assuming caregiving roles as unmarried co-residents, and (3) the influence of parents’ interpretations and transmission of filial norms. Second, family experiences during midlife encompassed (1) resilience amidst efforts and exhaustion, (2) emotional regulation and professional positioning through conflict-avoidance strategies, and (3) cross-generational responsibilities and coordination of life roles. Third, intergenerational relationships under co-residence involved (1) emotional support and unequal gendered divisions of care, (2) value tensions and role conflicts within the family, and (3) processes of adaptation, compromise, and the remedial role of institutional resources. These findings highlight the interplay of cultural values, midlife challenges, and structural conditions in shaping intergenerational dynamics of unmarried adult children living with their parents.