In Appalachia the word them is often used where the word those should be used.
- those can be used as an adjective or as a pronoun
- them is a pronoun and should never be used as an adjective
Correct usage: Those are the pants I want you to hem.
Incorrect usage: Them are the pants I want you to hem.
Correct usage: Hand me some of those crackers to eat with my soup.
Incorrect usage: Hand me some of them crackers to eat with my soup.
If I'm speaking I use them in the place of those-just like the incorrect usage above. If I'm writing I use both words correctly most of the time. I guess when I write or type I give the words more thought than when I'm talking.
This usage is also common in parts of the British Isles.