поставьте к приложению вопрос к подлежащему и к специальный вопрос и общий срочно
one day his cousin from came to visit him.

Ответ:

К подлежащему:

Who came to visit him one day?

Специальный вопрос:

When did his cousin from (пропущено откуда) come to visit him?

Общий:

Did his cousin from (London/Kolpino/...) come to visit him one day?

Объяснение: