His wife does not want to fast
Question

                My dear brother is a devoted muslim and is fasting in the month of ramadan, ilhamdiallah, but his wife who is muslim does not practise nor does she recognise the month of ramadan. He has no family near him, and is finding it hard to influence her to change or to get on the right path. He prays to Allah (swt) to guide her and give him patience, but he feels as though she is on a different path or does not want to know any better about what being a muslim is about. Can you please let me know what he can do to guide her better or make her become a more devout muslim.
Praise be to Allah.What your brother should do 
    is strive his utmost to guide his wife to the path of truth. He should use 
    all methods of exhortation and warning, reminding her of Allah and His 
    rights, and pointing out the danger of what she is doing. Then he should 
    strive to find her good friends, even if they are from among his relatives, 
    such as putting her in touch with righteous wives of his friends, who can 
    bring her useful tapes and pamphlets. If she obeys him, this is what he 
    wants, otherwise there is no reason why he should not use such methods as 
    forsaking her, if that will be useful in this situation. If forsaking is 
    prescribed with regard to the husband’s rights, perhaps it is even more 
    appropriate with regard to the rights of Allaah. 
It is narrated that Abu 
    Umaamah al-Baahili said: I heard the Messenger of Allaah  (peace and 
    blessings of Allaah be upon him) say: “Whilst I was sleeping, two men came 
    to me and took hold of my upper arm, and brought me to a rugged mountain. 
    They said: ‘Climb up.’ I said: ‘I cannot do it.’ They said: ‘We will make it 
    easy for you.’ So I climbed up until I was at the top of the mountain. There 
    I heard loud voices. I said: ‘What are these voices?’ They said: ‘This is 
    the screaming of the people of Hell.’ Then I was taken and I saw people 
    suspended by their ankles, with the corners of their mouths torn and pouring 
    with blood. I said: ‘Who are these?’ They said: ‘These are the people who 
    broke their fast before it was time to do so.’” 
Narrated by al-Bayhaqi, no. 
    7796; classed as saheeh by al-Albaani. 
If this is the punishment 
    for the one who breaks his fast before it is time, then what about the one 
    who does not fast at all? 
If, in addition to not 
    fasting, your wife does not pray at all, then she is beyond the pale of 
    Islam, according to the correct scholarly view. Based on that, it is not permissible for your brother to remain married to her. And Allaah knows best. 
See also question no. 
    12828.