Her name is Rebecca, she is from Jamaica and is my best friend's cousin
If your friend is your cousin's cousin's cousin, that make the two of you friend who might, or might not, be distantly related.
yes Jamaica is friend with America
Your friend is not responsible for what his cousin does or does not do. If you like your friend it shouldn't make any difference who or what his cousin is.
her sister
The predicate of this sentence is "is my friend's cousin".
It is Kingston my friend
Josh
The predicate of this sentence is "is my friend's cousin".
Just say it. It is your cousin, not your lover. It is his best friend, not his pole smoker...
The predicate of this sentence is "is my friend's cousin".
The predicate of this sentence is "is my friend's cousin".