This paper studies educational inequalities between children of marriage migrants and those of local-born parents using student test scores from Taiwan. We first find an average raw score gap of 9.2% for children of foreign parents. We then employ quantile regression methodology and find that, after introducing our extensive list of covariates, score gaps vanish for children with a mother from mainland China in all quantiles and for children with a Southeast Asian mother in the highest quantiles. In contrast, we identify large residual score gaps for children with a parent from a culturally more distant country in all quantiles. Different from previous studies which found the largest impact for language usage and parent education, we find that the physical home environment has the highest explanatory power in our analysis.