Grammar

1.197 agreement with noun

You choose which possessive determiner to use according to the identity of the person or thing that owns something. For example, if you want to identify something as belonging or relating to a particular woman, you always use 'her'. The following noun does not affect the choice.

I took off my shoes.
Her husband remained standing. He had his hands in his pockets.
The group held its first meeting last week.
The creature lifted its head.
...the two dark men, glasses in their hands, waiting silently.
...the car companies and their workers.
She had to give up her job.