How does the grandson of a son (grandson through a son) confer the status of *Asabah* (residuary heir) to female relatives?

Primary text

The grandson of a son (*Ibn Ibn Al-Ibn*) confers the status of *Asabah* to female relatives who are at the same generational level as him, such as his sisters, paternal cousin daughters, and paternal uncle's son's daughters, under all circumstances. Furthermore, he confers *Isabah* upon those in a higher generation than him, such as his paternal aunts and his paternal uncle's son's daughters, and those above them, provided they do not have a fixed obligatory share (*Dhawat Fard*). Those in a lower generation than him, such as his daughters, brother's daughters, and cousin's daughters, are excluded (*Yasqut*).