[en] The aim of this study is to analyse the factors determining the ethnic affiliation of children born to interethnic native couples in Finland, using data from couples with one Finnish-speaking and one Swedish-speaking partner, between 1988 and 2014. In addition to individual characteristics of each partner and contextual factors, we also consider the role of couple characteristics. We look at the affiliation of the first child, as well as the combined affiliation of the first two children, in order to analyse how often children from the same parents are affiliated to different ethnicities. Around 60% of first- and second-born children of interethnic couples born between 1988 and 2014 were affiliated to the Swedish-speaking minority. The affiliation of the second child seldom differs from that of the first. Children of mixed couples with a Swedish mother are more likely to be affiliated to the Swedish-speaking community. Boys are more likely than girls to be affiliated to the father’s community, and vice versa. In line with our expectations based on ethnic awareness, preference for cultural plurality and parental aspirations, the multivariate analysis shows a strong positive association between parental education level and the likelihood of the first child being Swedish speaking. The analysis also indicates that bargaining is not an important strategy when choosing a child’s ethnic identity.