She gave her house as a waqf (Islamic endowment) before she died; do the heirs have any right to it?
Question

                A woman died leaving behind 4 daughters, 2 sisters, and a brother who has 6 sons and 6 daughters. She left a house but she endowed it for Allah before she died. Do the heirs have the right to consider it heritage and start dividing it?.
Praise be to Allah.If the deceased gave her 
    house as a charitable waqf when she was in good health, then her heirs have 
    no right to it, because it has become a waqf and it cannot be sold, given 
    away or inherited. Al-Bukhaari (2737) and Muslim (1633) narrated from Ibn 
    ‘Umar (may Allaah be pleased with him) that Umar was given a share of land 
    in Khaybar, and he came to the Prophet (S) to consult him about it. He said: 
    O Messenger of Allaah, I have been given a share of land at Khaybar and I 
    have never been given any wealth that is more precious to me than it. What 
    do you command me to do with it? He said: “If you wish, you can ‘freeze’ it 
    and give it in charity.” So ‘Umar gave it in charity and stipulated that it 
    was not to be sold, given as a gift or inherited, and he gave it in charity 
    to the poor, relatives and slaves, for the sake of Allaah and for wayfarers 
    and guests; there was no sin on the one appointed to look after it if he ate 
    from it on a reasonable basis, and fed a friend without storing anything for 
    the future.  
But if she gave this house 
    as a waqf during the illness from which she died, then it comes under the 
    heading of a bequest, and a bequest can only apply to one-third of the 
    estate; any more than one-third can only be given as a waqf if the heirs 
    allow it. 
If the house is no more 
    than one-third of her estate, then the whole house is a waqf. If it is more 
    than one-third, then the bequest should be executed with regard to the 
    equivalent of one-third of the estate, and with regard to the rest, that is 
    dependent upon the consent of the heir. If they do not give consent, then 
    they may share it out as an inheritance. 
Ibn Qudaamah (may Allaah 
    have mercy on him) said in al-Mughni (5/365): A waqf that is given 
    during one’s final illness is treated as a bequest with regard to one-third 
    of the estate, because it is a donation. Therefore, if it is given during 
    the final illness, then it is to be executed with regard to one-third of the 
    estate, such as freeing slaves and giving gifts. If it is less than 
    one-third then it may be done without the consent of the heirs and it is 
    binding; if it is more than one-third, the equivalent of one-third should be 
    made a waqf, and the additional amount may be made a waqf if the heirs give 
    consent. We do not know of any difference of opinion concerning that among 
    those who say that a waqf is binding, because the rights of the heirs have 
    to do with the wealth that was present during the deceased’s illness, and it 
    is forbidden to give away more than one-third. End quote.