Relative Pronouns: who/which/whose

WHO
- Is used forPEOPLE:
"David lives near my house. He walks to school every day" = "David, who walks to school every day, lives near my house."
WHO refers to DAVID


WHICH
- Is used forANIMALS/THINGS:
"The red sweater is dirty. I was wearing it yesterday."= "The red sweater, which I was wearing yesterday, is dirty."
WHICH refers toTHE RED SWEATER
("it" doesn't appear in the relative clause, because the referent is "which" now)

WHOSE
- Is used to expressPOSSESSION:
"Anne is moving to London. Her husband is working in England."=
"Anne, whose husband is working in England, is moving to London."
WHOSE refers to HER HUSBAND