Key words: Intermarriage, language choice, language in the home domain. This study aimed at investigating why Acehnese intermarriage couples choose Bahasa Indonesia as medium of communication in the home domain and discovering the influences of their language choice on the survival of their mother tongues. A qualitative method was used in this study in which interview guide and questionnaire were applied as the instruments. This study was conducted in Banda Aceh and Aceh Besar with twenty five Acehnese intermarriage couples who use Bahasa Indonesia to interact in the home domain as the subjects. The result of interview showed that there were some reasons of those couples to prefer Bahasa Indonesia which are: (1) to accommodate spouse; (2) to be convenient; (3) to expand social network; (4) Bahasa Indonesia is the community language; (5) Bahasa Indonesia is the national language and the medium of instruction; (6) Bahasa Indonesia is dominant language; (7) Bahasa Indonesia is a neutral choice; (8) the couples are less motivated to use the indigenous languages. In addition, the conclusion of questionnaire filled in by the respondents revealed that the intermarriage couples’ language choice might promote linguistic suicide; that is, the parents do not pass their mother tongues to the children for any longer. Linguistic suicide causes the children to own Bahasa Indonesia as their first language or mother tongue resulting in an inability to own their parents’ mother tongues. Indeed, the phenomenon of intermarriage couples, especially those living in urban and sub urban areas, preferring Bahasa Indonesia to be used in family interaction could threaten the survival of couples’ mother tongues if it keeps continuing since the number of younger speakers keeps decreasing.