Citizenship can offer opportunities and resources that help facilitate the social, economic, and political integration/inclusion of immigrants in the United States. Despite this, a significant number of immigrants are not naturalizing when eligible. Previous studies point to how individual characteristics (e.g., English proficiency, financial resources) and place-based attributes (e.g., social networks associated with ethnic enclaves) contribute to (racialized) disparities in immigrants’ propensities to naturalize. However, less empirical work has been done to extrapolate how family effects simultaneously shape an immigrants’ decision and ability to gain citizenship. We find that having a naturalized spouse or family member in the household statistically improves the odds of naturalization, likely because of information sharing. On the other hand, having an undocumented spouse or family member significantly reduces the odds, perhaps because ofchilling effects from the criminalization of undocumented immigrants in the United States. This impacts the usual policy recommendations to improve naturalization, most of which center on improving immigrants’ English proficiency and lowering financial barriers. We suggest that this should be supplemented with family-based strategies to reach immigrants, particularly women, who are the first in their households to naturalize. We also argue that improving the context of reception for undocumented and mixed-status families – perhaps through changing reporting requirements, reducing state-federal interaction on immigration enforcement, and pursuing comprehensive immigration reform that includes legalization of the undocumented – could have positive impacts.