"he wrote to his folks every day"
people in general (often used in the plural);
"they're just country folk"
"folks around here drink moonshine"
"the common people determine the group character and preserve its customs from one generation to the next"
- Folks around here will always lend a hand if you need it.
- We live with the country folks.
- Folks that blurt out just what they think wouldn't be so bad if they thought.
- How are your folks?
- Have you ever met my folks?
- I'd like you to meet my folks.