The 30 bilingual participants were recruited via social media and were paid for their participation. Inclusion criteria are based on age, context, and manner of acquisition of French and Dutch. In this replication, like in the original study, we recruited early simultaneous bilingual participants who were raised by a Dutch speaking mother and French speaking father or vice versa. Both parents consistently spoke their own mother tongue in raising their children from birth onwards. Late bilinguals were not included in this study. Sixteen participants had a French speaking father and Dutch speaking mother, and 14 had the converse. Information concerning language background (proficiency estimates, contact with other languages, etc.) was collected using a language history questionnaire (also used in the original study). This questionnaire addressed the following questions: age, gender, place where the participant was raised, mother tongue of the parents, language spoken with the mother, language spoken with the father, how consistently the same language is spoken with the same parent, what language was spoken in every stage of the school career and during leisure activities, which language is used the most, in which language the participant thinks spontaneously and an estimate of proficiency in both languages. Similar information was gathered from the monolingual participants.