Family dinnertime conversations are key settings where children learn behavior regulation, narrative skills, and knowledge about the world. In this context, parents may also model and socialize gender differences in language. The present study quantitatively examines gendered language use across a family dinnertime recorded with 37 broadly middle-class, racially diverse parents, a child between 9 and 12 years old, and their siblings. Conversations were parsed according to topic (behavior regulation, narrative talk, or general knowledge), and utterances were coded as either affiliative or assertive. Overall, mothers contributed more utterances to the conversations, but this effect was moderated by topic. Mothers talked more than fathers in conversations about behavior and narrative, whereas mothers and fathers spoke equally as often about general knowledge, suggesting that differences are modulated by topic in theoretically informative ways. Relations in language use between parents and children were evident for mothers and daughters. Implications are discussed.