Using "niya" and "siya"?

understand, siya he/she , niya him/her, in rosetta stone have been corrected use niya in "kailangan niya ng gamot" use siya in "bumibili siya ng gasolina".

wouldn't translate "him needs medicine" , "he buying gasoline"? why niya in first example?

from understand, siya he/she , niya him/her, in rosetta stone have been corrected use niya in "kailangan niya ng gamot" use siya in "bumibili siya ng gasolina". wouldn't translate "him needs medicine" , "he buying gasoline"?...

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