All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
First, we would like to say that the Muslim should not busy himself with the distribution of his estate while he is still alive as long as there is no necessity for that because things might change and perhaps a new heir is born or a current heir dies, and thus the distribution takes a different course. Some righteous predecessors disliked asking about what has not yet happened because this includes exaggeration and groundless speculations without a necessity. Were there a necessity, such as fearing that one’s inheritance will not be distributed according to the Sharee‘ah after his death because he lives in a non-Muslim country or the like, it would be permissible to distribute it during his life. If the Muslim dies leaving behind a wife, three sons, four daughters, and a brother without leaving any other heir, the inheritance (the house + his properties) will be distributed as follows:
Finally, it should be noted that the matter of inheritance is very complex an issue, so a mere Fatwa which is an answer issued according to the question is not enough. Rather, the matter should be taken to an Islamic court to look into the case, or it should be presented orally (in person) to the scholars in case there are no Islamic courts. It might be that there is an heir who would not be known except after investigation, and there might also be a will, debts, or other dues that are not known to the heirs. It is known that these rights come in priority over the right of the heirs. Therefore, the inheritance should not be divided without resorting to an Islamic court, if any, in order to fulfil the interests of the dead and the live people.
Allaah Knows best.