Abstract
The existence of three possible languages within intermarriage family, for example Javanese and Sasaknese from their parents and Indonesian from their surrounding should have led children become bilingual in nature. However, the reversed condition is prevailing where the use of Indonesian is predominantly used. This research locates three different aspects of family language policy namely language ideology, language management and language practice. This research aims at finding out why parents of intermarriage family incline the use of one language within family domain. This research employed qualitative data in order to understand and interpret family language behaviour and uses multi staged purposive sampling. The sample was four of immigrant mothers and four of Sasak mothers. The result showed the tendency to use indonesian in a family domain is due to habitus which leads to culture capital and symbolic capital.