Are the following sentences correct and equivalent in meaning? Please correct my mistakes. Thank you very much!
I am one of Susan's friends.
= I am a friend of Susan's.
He’s a brother of Maria’s.
= He is one of Maria’s brothers.
A friend of my sister’s has opened a café on Dawson Street.
= One of my sister’s friends has opened a café on Dawson Street.
She was a daughter of the President’s.
=She was one of the President’s daughters.