The couple and their daughter died one after another in an accident; how should their estate and diyah be divided?
Question

                In a car accident an entire family died, consisting of three members, a father, a mother and a girl. They died in the following order: first the mother, then the father, then the daughter.  

The mother has a father, mother, brothers and sisters.  

The father has a mother and sisters and a brother. 

My question is: who should take the prescribed diyah (blood money), and how should the diyah and the rest of the estate and wealth be divided?.
Praise be to Allah.
    If the person 
    at fault in this accident is someone other than these people, such as the 
    driver of another car, and what is meant by the father and mother is the 
    husband and wife, and they died in the order mentioned, then the one who 
    died later inherits from the one who died earlier, and the diyah of each one 
    who died is to be added to his estate and divided among his heirs. 

    Shaykh Ibn 
    Baaz (may Allaah have mercy on him) said: If two or more people who would 
    inherit from one another die in a building collapse, by drowning, in a fire 
    or in a plague and the like, then there are five scenarios, one of which is 
    where one of those who would inherit from one another dies after the others, 
    even if it is only a moment later; the one who dies later inherits from the 
    one who dies earlier, according to consensus. End quote from al-Fawaa’id 
    al-Jaliyyah fi’l-Mabaahith al-Faradiyyah. 

    Based on that, 
    the diyah of the wife and the rest of her estate is to be divided as 
    follows: 

    Her husband 
    gets one-quarter, because of the presence of a descendant who inherits. 

    Her daughter 
    (the girl) gets half. 

    Her father 
    gets one-sixth. 

    Her mother 
    gets one-sixth. 

    Her brothers 
    and sisters do not get anything, because the father’s presence prevents 
    that. 

    It may be 
    noted in this case that the shares of the heirs add up to more than one 
    (whole number) This is what the scholars call al-‘awl, and in this case, 
    something has to be deducted from the share of each heir, so as to be just 
    and fair. So when the estate is divided, it is divided into thirteen equal 
    parts: 

    The husband 
    gets three parts; originally he gets one-quarter, which is 3 out of 12 
    parts. 

    The daughter 
    gets 6. 

    The mother 
    gets 2. 

    The father 
    gets 2. 

    The diyah of 
    the husband and the rest of his estate – including the quarter of his wife’s 
    estate to which he is entitled – is to be divided as follows: 

    His daughter 
    gets half. 

    His mother 
    gets one-sixth. 

    His brother 
    and sisters get the rest, with the male getting the share of two females. 

    In addition to 
    the diyah for the child, there is what she inherited from her parents, and 
    her share of the diyah for her father and mother, and it is to be divided 
    among her living heirs. There are no heirs in this case except her two 
    grandmothers and her paternal uncle (her father’s brother). 

    As for her 
    paternal aunts and maternal aunts, they do not inherit because of the 
    presence of al-‘asbah (male relative(s) on the father’s side). 

    Similarly, the 
    maternal grandfather does not get anything. 

    The two 
    grandmothers (father’s mother and mother’s mother) get one-sixth, to be 
    divided equally between them. 

    The rest goes 
    to the paternal uncle as a male relative on the father’s side. 

    The matter 
    should be referred to the shar’i court, to make sure that the people you mentioned are the only heirs. 

    And Allaah knows best.