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.
The remainder of the estate is to be divided among the full brother and the two full sisters by virtue of Ta‘seeb (i.e. by virtue of having a paternal relation with the deceased and not having an allotted share in the estate); the male gets double the share of the female. Allaah, The Exalted, says (what means): {… If there are both brothers and sisters, the male will have the share of two females…} [Quran 4:176]
The rest of the deceased's relatives do not get any share because they are totally excluded by the presence of the full brother.
Hence, the estate should be divided into 12 shares; the daughters get the two thirds (8 shares, each gets 2 shares), the full brother gets 2 shares, and each full sister gets 1 share.
Allaah Knows best.