I’m not the first person to highlight this… and I’m sure I won’t be the last. Some people may say it doesn’t matter, and I’m being pedantic… maybe they’re right…
Anyhow… for anyone who’s interested. A brief note on the correct usage.
There: This word illustrates the place or position of something.
- My car is over there.
- There is a bump on my head.
Their: This word illustrates possession of something.
- That is their dog.
- Their car is a Ford.
They’re: This is short for "They are".
- They are all going to the beach = They’re all going to the beach.
- We know they’re all English = We know they are all English.
Putting it all together:
They’re fairly sure that their car is parked over there.