Sheikh Muhammad Ibn Saleh Al-`Uthaimin

Q: What should a man do, if he orders his family to pray, but they do not listen to him? Should he live with them and mix with them, or leave the house?

A: If these members of the family do not pray at all, then they are disbelievers, apostates, outside the fold of Islam, and it is not permissible to live with them. But it is an obligation upon him to preach to them and implore them repeatedly, in the hope that Allah may guide them, because the one who abandons prayer is a disbeliever - may Allah protect us. The evidence for this is to be found in the Qur'an and Sunnah, the sayings of the Companions, may Allah be pleased with them, and the correct view (of the scholars).

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Adopted from Fatawa Islamiyah Volume 1, First Edition, Pages 262-263