Their aunt wants to corrupt them; should they cut off ties with her?
Question

                I have a problem with my aunt. She hurts our family and especially my mother, her sisters. She refuses to get married (she is almost 40), she lives on her own and goes to haram parties and weddings, she dresses unislamically and behaves in an unislamic manner and mixes with non-mahram men. She is suspicious of my mother and does bad things to my mother or us children. She is infected with Hepatitis and she tries to give me her disease on purpose by eating from my food or drinking from my cup or using my lip gloss when I don't know about it. She tells me she doesn't like my mother but pretends to be happy when my mother is around. She tries to make me go to the haram places she goes when I visit her. She cut off ties from the whole family and said that she hates everyone except us children but she treats us bad. She is always working for the needs of other women who backbite and look down on her and she does more for them than her own sisters and then she makes us kids work on things for those women. Me and my mother don't know what to do?? We can't cut off relations but the more we are around her the more my eemaan goes down and the more she hurts us. What should we do?.
Praise be to Allah.
    The command to uphold the ties of kinship is one of the first 
    commands that were revealed in Islam. It is indicated in a number of proven 
    saheeh ahaadeeth, such as the following: 

    (a)

    The story of how ‘Umar ibn ‘Absah became Muslim. He asked the 
    Prophet  (peace and blessings of Allaah be upon him): With what were you 
    sent? He  (peace and blessings of Allaah be upon him) said: “He has sent 
    me to uphold the ties of kinship, to break the idols and to proclaim the 
    Oneness of Allaah, not associating anything with Him.” Narrated by Muslim 
    (832). 

    (b)

    The story of Abu Sufyaan and Heraclius when he sent for him 
    and said: What does he – meaning the Prophet  (peace and blessings of 
    Allaah be upon him) – enjoin upon you? He said: He enjoins us to pray, give 
    charity, be chaste and uphold family ties.” Narrated by al-Bukhaari (7) and 
    Muslim (1773). 

    In many verses Allaah warns us against severing the ties of 
    kinship, and states that there will be numerous punishments for the one who 
    does so, which includes incurring the curse of Allaah and a bad end. Allaah 
    says (interpretation of the meaning): 

    “And those who break the Covenant of Allaah, after its 
    ratification, and sever that which Allaah has commanded to be joined (i.e. 
    they sever the bond of kinship and are not good to their relatives), and 
    work mischief in the land, on them is the curse (i.e. they will be far away 
    from Allaah’s Mercy), and for them is the unhappy (evil) home (i.e. Hell)”

    [al-Ra’d 13:25]

    Some relatives may cause the one who upholds ties with them 
    to fall into sin, especially if he is unable to change the evil that they 
    are doing.  They may insist – for example – on listening to music and mixing 
    and indulging in swearing, mocking and backbiting. Such people have an 
    effect on their visitors and the one who seeks to uphold ties with them. The 
    Muslim has to advise his relatives as much as he is able to. They are more 
    entitled to this advice than others, but only if that will benefit them, 
    whether he is certain of that or thinks it most likely. But if he sees that 
    they are persisting in sin and especially major sins, and that is affecting 
    his faith and religious commitment, then it is sufficient for him to uphold 
    ties with them in the minimum fashion, so that he will not be severing the 
    ties of kinship. So instead of visiting them, he can just call them on the 
    phone, and if he visits them he does not have to stay for long, and so on.  
     

    But this should after trying his best to advise them and 
    exhort them and bring them back to the right way, as well as turning to 
    Allaah in du’aa’, asking Him to guide them to the straight path. 

    And Allaah knows best.