Within the United States, approximately 17% of marriages occur between spouses of different races and/or ethnicities, while 1 out of every 7 children born identify as multiracial. Research suggests that, compared with monoracial couples, multiracial couples are at increased risk for negative relationship outcomes including divorce or separation. Although little research explores why these disparities exist, we surmise that poorer relational outcomes in multiracial families may be the result of heightened conflict caused by a greater difference in partners’ values and beliefs. In an understudied sample of expectant couples working in low-wage jobs, we examine differences in partner gender ideology and parenting beliefs as possible mechanisms underlying differential outcomes in relationship quality among multiracial families. This study examines whether the relationship between couple’s racial and ethnic composition (i.e., same versus different racial/ethnic backgrounds) and relationship quality (conflict, love, satisfaction) is mediated by differences in parenting beliefs and gender ideology. It is hypothesized that one mechanism that explains poorer outcomes (i.e., more conflict, less love, less satisfaction) is greater cross-racial differences in parenting beliefs and gender ideologies. Results indicated that multiracial families have lower love and relationship satisfaction and greater partner differences in gender ideology beliefs, however, gender ideology did not mediate the relationship between couple type and relationship quality. Overall, this study highlights the need for more longitudinal research and the exploration of other mechanisms underlying the different relationship outcomes for monoracial and multiracial families like social support, religiosity, and multicultural values.