If a father needs money, can he take money that his son has earned in a café?
Question

                Can my father and mother who are in desperate need take money from my brother who owns a café in which people play cards and smoke the narghileh?.
Praise be to Allah.Firstly: 
A father may 
    take whatever he needs from his son’s wealth, so long as that will not harm 
    the son. 
That is 
    because of the report narrated by Ibn Maajah (2291) and Ibn Hibbaan in his
    Saheeh from the hadeeth of Jaabir, and by Ahmad (6902) from the 
    hadeeth of ‘Abd-Allaah ibn ‘Amr (may Allaah be pleased with him), according 
    to which a man said: O Messenger of Allaah, I have wealth and a son, and my 
    father wants to take all my wealth. He said, “You and your wealth belong to 
    your father.” This hadeeth was classed as saheeh by al-Albaani in Saheeh 
    Ibn Maajah. 
This taking 
    is subject to conditions that were stipulated by the fuqaha’. Ibn Qudaamah 
    (may Allaah be pleased with him) said: The father may take from his son’s 
    wealth whatever he wants, and it becomes his, whethere the father needs what 
    he takes or does not need it, whether the son is a child or an adult, 
    subject to two conditions: 

    1-That he does not treat the son 
    unfairly or harm him, and he does not take anything that his son needs.
    

    2-That he does not take his son’s 
    wealth and give it to another son. This was stated by Ahmad, because it is 
    forbidden to single out one of his sons for giving from his own wealth, so 
    it is more forbidden to single out one of his sons for giving from another 
    son’s wealth. It was narrated that Masrooq gave his daughter in marriage for 
    ten thousand, then he took it and spent it for the sake of Allaah, and he 
    said to the husband: Provide your wife’s trousseau.
Abu 
    Haneefah, Maalik and al-Shaafa’i said: He does not have the right to take 
    from his son’s wealth anything but what he needs, because the Prophet  
    (peace and blessings of Allaah be upon him) said: “Your blood and your 
    wealth are scared to you, as sacred as this day of yours in this month of 
    yours.” Agreed upon. End quote from al-Mughni (5/395). 
There is a 
    report which supports the view of the majority, that it is conditional upon 
    the father’s need. Al-Haakim (2/284) and al-Bayhaqi (7/480) narrated that 
    ‘Aa’ishah (may Allaah be pleased with him) said: The Messenger of Allaah 
     (peace and blessings of Allaah be upon him) said: “Your children are a 
    gift from Allaah to you, ‘He bestows female (offspring) upon whom He 
    wills, and bestows male (offspring) upon whom He wills’ [al-Shoora 42:49]. 
    They and their wealth are yours if you need it.” This hadeeth was classed as 
    saheeh by Shaykh al-Albaani in al-Silsilah al-Saheehah (2564). 
If the 
    father needs money, he may take from his son’s wealth, and spend it on 
    himself and his dependents, so long as that will not harm the son, and he 
    should not take something that the son needs, like his car that he drives 
    and so on. See also question no. 9594. 
Secondly: 
Smoking 
    narghileh pipes is haraam, and the money that is earned from that is also 
    haraam, but if there are things in the café that it is permissible to eat or 
    drink, such as tea, coffee and so on, then the money that your brother earns 
    from the café is regarded as mixed wealth, which includes both halaal and 
    haraam. If that is the case, it is permissible for others to eat from it, if 
    they interact with its owner by buying, selling, accepting gifts and so on, 
    although it is better to refrain from dealing with him and taking his 
    wealth. But as your father needs this money, there is no sin on him if he 
    takes from him, but he should also advise his son to fear Allaah, may He be 
    exalted, and stop dealing in haraam things. 
Al-Dasooqi 
    (may Allaah have mercy on him) said: If most of a person’s wealth is halaal 
    and a little of it is haraam, then it is permissible to deal with him, lend 
    him money or borrow from him, and eat from his wealth. But if most of his 
    wealth is haraam and a little of it is halaal, then Ibn al-Qaasim is of the 
    view that it is makrooh to deal with him, lend him money or borrow from him, 
    and eat from his wealth, and this is the correct view. But if all his wealth 
    is haraam, then it is not allowed to deal with him and lend him money or 
    borrow from him, or enter into any other financial transactions with him. 
    End quote from Haashiyat al-Dasooqi (3/277). See also question no. 
    45018. 
With regard 
    to the ruling on playing cards, please see question no. 
    12567 and 
    321. 
And Allaah 
    knows best.