About the possessive case ('s)

Good evening, I have a doubt about the possessive case in English.

I did an exercise of Portuguese - English translation into the possessive case:

"Um primo do meu pai trabalha na Macy, em Nova Iorque" .

"A cousin of my father's works at the Macy, in New York", but I saw other translation "My father's cousin works at Macy's in New York".

Which of these sentences is correct ?