A qualitative research with multiple methods, which investigates the phenomena of language shift and sustainment it of one Dine´ family. A Dine´ father was interviewed. The mother tongue should still be use at home however, the Navajo language is taught at school. I spent eighty plus hours interviewing the Dine´ father. I spent countless hours of observing Shizhe'e´ and the interview was all done in Dine´ Bizaad. Shizhe'e´ explained the challenges and obstacles of maintaining the mother tongue. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]