She has both male and female children; who spend on her?
Question

                I have six sisters and five brothers. Our father is deceased and he left us an inheritance in the form of a building that is rented out. When we asked for a share of the rental income, our oldest brother got angry and refused to give that to us, so we referred the matter to the court, which confirmed our right to our share of the rental income. At that point he stopped spending on our mother, because he was angry at what we had done and he argued that we had no right to take our share, and he said that we were now obliged to spend on our mother. Please note that we [sisters] are married and do not work. Even when [our mother] went into hospital, he refused to pay her medical costs. I hope that you can explain the following: 

Who is obliged to spend on the parents?

Does he have the right to prevent us from taking our share of the rental income on the grounds that he is spending on our mother? 

Does he have the right to stop spending on her when he is able to do so? Please note that she needs this maintenance.
Praise be to Allah.
      Firstly: 

    The inheritance is to be divided as commanded by Allah, may 
    He be exalted, and it is essential to avoid overstepping the mark in that 
    regard. After mentioning inheritance, Allah says (interpretation of the 
    meaning): 

    “These are the limits (set by) Allaah (or ordainments as 
    regards laws of inheritance), and whosoever obeys Allaah and His Messenger 
    (Muhammad صلى الله عليه وسلم) will be 
    admitted to Gardens under which rivers flow (in Paradise), to abide therein, 
    and that will be the great success.

    14. And whosoever disobeys Allaah and His Messenger 
    (Muhammad صلى الله عليه وسلم), and 
    transgresses His limits, He will cast him into the Fire, to abide therein; 
    and he shall have a disgraceful torment”

    [al-Nisa’ 4:13, 14]. 

    So your brother does not have the right to keep the rental 
    income from the building and deprive the rest of the heirs of that. 

    Secondly: 

    The duty of spending on parents who are poor is that of their 
    children, male or female, if they are independent of means and have wealth 
    surplus to what they require for their own maintenance and that of their 
    dependents, because Allah says (interpretation of the meaning):

    “And your Lord has decreed that you worship none but Him. 
    And that you be dutiful to your parents”

    [al-Isra’ 17:23]. 

    A man asked the Prophet (blessings and peace of Allah be upon 
    him): Which of the people is most deserving of my good companionship? He 
    said: “Your mother.” He said: Then who? He said: “Then your mother.” He 
    said: Then who? He said: “Then your mother.” He said: Then who? He said: 
    “Then your father.” Narrated by al-Bukhaari (5971) and Muslim (2548). 

    It was narrated from ‘Aa’ishah (may Allah be pleased with 
    her) that the Prophet (blessings and peace of Allah be upon him) said: 
    “Among the best of that which a man consumes is what he earns (by his own 
    efforts), and his son is part of that which he earns.” Narrated by Abu 
    Dawood (3528) and classed as saheeh by al-Albaani in Saheeh Abi Dawood.                                                                     
    

    Ibn al-Mundhir (may Allah have mercy on him) said: The 
    scholars are unanimously agreed that maintenance of poor parents who have no 
    income or wealth should be spent on from the wealth of their child. End 
    quote from al-Mughni, 8/169 

    Based on that, your mother’s maintenance should come from her 
    share of the rental income, which is one eighth, and she has the right to 
    sell her share to one of the heirs or anyone else, and to spend on herself 
    from that income. 

    If that is not sufficient for her maintenance, it should be 
    topped up from the wealth of her children who are independent of means, 
    whether they are males or females. If a married woman gets enough 
    maintenance from her husband and she has surplus wealth – even if it comes 
    from the rent for the building – she has to spend on her mother. 

    Shaykh Ibn Jibreen (may Allah have mercy on him) said: If the 
    parents are poor and the daughter has wealth that is surplus to her needs, 
    she has to spend on her parents according to their needs without that 
    detracting from her own needs. End quote. 

    The maintenance should be in accordance with the shares of 
    inheritance, because of the general meaning of the verse in which Allah says 
    (interpretation of the meaning): “And on the (father’s) heir is incumbent 
    the like of that (which was incumbent on the father).” [al-Baqarah 2:233]. 
    And the share taken from the male should be equivalent to the share taken 
    from two females. 

    Your brother does not have the right to keep the rental 
    income on the grounds that it has to be spent on (your mother’s) 
    maintenance; rather he should give each heir his or her share and all the 
    children should reach an agreement to pay enough to cover their mother’s 
    maintenance. No matter how much that may be, it is nothing compared to the 
    rights that she has over you. 

    Al-Bukhaari narrated in al-Adab al-Mufrad (918) from Abu 
    Burdah that Ibn ‘Umar (may Allah be pleased with him) saw a Yemeni man 
    circumambulating the Ka‘bah, carrying his mother on his back. He said: I am 
    her trained camel; do you think I have paid her back? Ibn ‘Umar said: No, 
    not even one contraction. 

    Classed as saheeh ibn al-Albaani in Saheeh al-Adab 
    al-Mufrad. 

    So fear Allah and set things straight amongst yourselves; 
    remember that Allah is always watching how you treat your mother, who is the 
    most deserving of people of your good company and care. 

    We ask Allah to help and guide us and you. 

    And Allah knows best.