He does not have any work; can he stay with his paternal aunt who is married to a Christian?
Question

                I am a young Muslim man and I am going through a hard time, praise be to Allaah. I do not have any work, and I am married and have a daughter. I live with my adoptive father. My paternal aunt is married to a Christian, and she is the one who is supporting us. She wants us to live with her in one house, and you know how the Christians drink alcohol and so on. My question is as follows: Can I live with her, as I cannot get a separate house at the moment? My second question is: Now I am their adopted son, and I want to know the Islamic ruling on that. May Allaah reward you with good.
Praise be to Allah.Firstly: 
We ask 
    Allaah to make things easier for you, and to relieve your distress and grant 
    you provision from His bounty. 
Secondly: 
If what you 
    mean by adoption is that you are named after the person who adopted you and 
    you are regarded as his son with regard to mahrams, inheritance etc, then 
    this is the kind of adoption that is haraam and was abolished by Islam. 
But if what 
    you mean is that he took care of you, sponsored you and treated you kindly, 
    without your taking his name, then there is nothing wrong with that, rather 
    it is praiseworthy and it is hoped that the one who does that will be 
    rewarded. See question no. (10010). 
It is 
    obvious that according to shar’i rules, you are a “stranger” (non-mahram) in 
    this house, so you cannot be alone with the sister of the one who adopted 
    you, or with his wife or daughter, and you are not entitled to inherit from 
    any of them, and your wife cannot uncover in front of the one who adopted 
    you, and he cannot be alone with her, because he is not your father 
    according to sharee’ah. 
Thirdly: 
It is not 
    permissible for a Muslim woman to marry a kaafir, whether he is a Jew, a 
    Christian or anything else, because Allaah says (interpretation of the 
    meaning): 
“And give 
    not (your daughters) in marriage to Al‑Mushrikoon (polytheists) till they 
    believe (in Allaah Alone) and verily, a believing slave is better than a 
    (free) Mushrik (idolater), even though he pleases you. Those (Al-Mushrikoon) 
    invite you to the Fire, but Allaah invites (you) to Paradise and forgiveness 
    by His Leave, and makes His Ayaat (proofs, evidences, verses, lessons, 
    signs, revelations, etc.) clear to mankind that they may remember”

    [al-Baqarah 2:221] 
“then if 
    you ascertain that they are true believers send them not back to the 
    disbelievers. They are not lawful (wives) for the disbelievers nor are the 
    disbelievers lawful (husbands) for them”

    [al-Mumtahanah 60:10]
Shaykh 
    al-Islam Ibn Taymiyah (may Allaah have mercy on him) said: The Muslims are 
    unanimously agreed that a kaafir cannot inherit from a Muslim and a kaafir 
    man cannot marry a Muslim woman. End quote from al-Fataawa al-Kubra 
    (3/130). 
What the 
    sister of your adoptive father has done by marrying a Christian man is a 
    great wrong, and it is an invalid marriage which must be annulled; it is not 
    permissible for her to stay with this man under any circumstances. She also 
    has to repent to Allaah and beseech Him to forgive her and pardon her. 
It is not 
    permissible for you to live with her in the presence of the husband 
    mentioned, because that involves remaining silent about this great wrong, as 
    well as what you have mentioned about him drinking alcohol. 
All of this 
    is in addition to the fact that this woman is not really your paternal aunt, 
    so it is not permissible for you to enter upon her or be alone with her, let 
    alone live with her in the same house! 
Fourthly: 
You should 
    look for permissible work by means of which you can take care of yourself 
    and your family. Be sure that provision comes from Allaah and that there are 
    many means of acquiring provision, although some people are unaware of that. 
    The Prophet  (peace and blessings of Allaah be upon him) said: “By 
    Allaah, for one of you to go out and carry firewood on his back and sell it 
    is better for him than to ask a man who may give him (something) or withhold 
    from him.” Narrated by al-Bukhaari (1470) and Muslim (1042). 
You have an 
    example in ‘Abd al-Rahmaan ibn ‘Awf (may Allaah be pleased with him). 
    Al-Bukhaari (2048) narrated that ‘Abd al-Rahmaan ibn ‘Awf (may Allaah be 
    pleased with him) said: When we came to Madeenah, the Messenger of Allaah 
     (peace and blessings of Allaah be upon him) established brotherhood 
    between me and Sa’d ibn al-Rabee’. Sa’d ibn al-Rabee’ said: I am the 
    wealthiest of the Ansaar, and I will give you half of my wealth. And see 
    which of my two wives you want; I will give her up for  you and when she 
    becomes permissible (after the divorce and ‘iddah), you can marry her. 
‘Abd 
    al-Rahmaan said to him: I have no need of that. Is there any market in which 
    trading is done? 
He said: The 
    market of Qaynuqa’. 
The next 
    morning, ‘Abd al-Rahmaan went there and brought some dried yoghurt and ghee, 
    then he went there the next day, and soon ‘Abd al-Rahmaan came with traces 
    of yellow perfume on him. 
The 
    Messenger of Allaah  (peace and blessings of Allaah be upon him) said: 
    “Have you got married?” He said: Yes. He said: “To whom?” He said: To an 
    Ansaari woman. He said: “How much (dowry) did you give her?” He said: The 
    weight of a date stone in gold (or a date stone of gold). The Prophet ( 
    (peace and blessings of Allaah be upon him) said: “Give a wedding feast, 
    even if it is with just one sheep.” 
So seek the 
    help of Allaah, and do not feel helpless; ask Allaah to make you independent 
    of means by His bounty. 
And Allaah 
    knows best.