How can a minor inherit an apartment that his father left?

Hi, My girlfrind has a son. She lives in South America with him. THey are not american. Her ex husband died and left an apartment in Miami. Her inlaws have taken over the apartment. What can she do to get the apartment back to her son?

Did he leave it to the boy in a will?

She needs to contact an attorney in Florida about getting a probate case started.