His grandfather left a bequest to his heirs who are poor; is it permissible for him to take from that bequest?
Question

                My grandfather had property such as buildings, markets and so on, and he has died, may Allah have mercy on him. We are among his heirs but he made a will giving two thirds of his wealth to the Haram and the other third to the poor and needy among his heirs. Is it permissible for me to take from it, knowing that I am employed?.
Praise be to Allah.
      It is not permissible for a Muslim to bequeath more than 
      one third of his wealth or to bequeath any of his wealth to his heirs. 
      This has been explained in the answer to questions number
      111918 and
      111917. 

    Based on that, your grandfather's bequest is not valid, apart 
    from what he bequeathed to the Haram, which should be executed with regard 
    to one third only. 

    As for the second third that was bequeathed to the Haram and 
    the third that he bequeathed to his heirs who are poor, these bequests are 
    not valid and should not be executed except with the permission of the other 
    heirs. 

    Al-Nawawi said: The scholars of our time are unanimously 
    agreed that if a person has an heir, his will should not be executed with 
    regard to more than one third, except with the permission of the heirs. And 
    they are unanimously agreed that with the heirs’ permission, his will may be 
    executed with regard to all of the wealth.

    End quote from Sharh Saheeh Muslim, 11/77 

    Ibn Qudaamah said: To sum up: if a person leaves a bequest to 
    his heir for which the other heirs did not give permission, it is not valid 
    and there is no difference of opinion among the scholars concerning this. 
    Ibn al-Mundhir and Ibn ‘Abd al-Barr said: The scholars are unanimously 
    agreed on this, and there are reports from the Messenger of Allah (blessings 
    and peace of Allah be upon him) to that effect.

    End quote from al-Mughni (6/449) 

    If some of the heirs agreed to the bequest that is more than 
    one third or the bequest to an heir, but some others do not agree, then in 
    this case the bequest should be executed with regard to the proportion of 
    heirs who agreed to it only. 

    If the heirs or some of them agree to the bequest of your 
    grandfather to his heirs who are in need and are poor, then it is 
    permissible to you to take some of it if you are poor and in need. 

    If a person is working but his income is not sufficient to 
    meet his essential needs, then he is regarded as poor. But if his salary is 
    sufficient, then it is not permissible for him to take from it. 

    Shaykh al-Islam Ibn Taymiyah said: Everyone who does not have 
    enough to suffice himself and his dependents is one of the poor and needy. 
    End quote from Majmoo‘ al-Fataawa, 28/570. 

    Shaykh Ibn Baaz said: If a person has an income that is 
    sufficient for food, drink, clothing and accommodation, from a waqf or 
    earnings or employment and the like, then he cannot be called poor or needy. 
    End quote from Fataawa Ibn Baaz, 14/266 

    And Allah knows best.