1.
Avrahom asks:
A gut a-moed to the Chavrei HaKollel
I never understood why the pasuk the very first Achoso is not considered full, because then the pasuk defines further even just your paternal or maternal sister as well etc....
Avrahom , United States
2.
The Kollel replied:
Dear Avrahom,
After all, the Pasuk does not say "your sister even from father or from mother" (then there would be three sister cases). The way it is written, there is only the half cases, and the full sister is not written.
All the best,
Reuven Weiner