(personal) genitive of sie: of her, of them

(possessive) inflection of ihr (“her, their”):
/ (possessive) inflection of ihr (“her, their”):
/ (possessive) inflection of ihr (“her, their”):

yours (polite/formal; both singular and plural)

genitive of Sie (addressing politely or formally one or more people)

inflection of Ihr:
/ inflection of Ihr:

from her; on her behalf; as for her / from them; on their behalf; as for them