Sympathy Cards Phrases To Whom Do We Send Sympathy Cards?

To whom do we send sympathy cards? - sympathy cards phrases

My husband's grandmother died today and tomorrow, we are not sure that we send sympathy cards. His father has five brothers and sisters (along the speech, others not), and my husband is only in connection with an uncle. Who should we send cards? Only my parents? All children from their grandmother? Six brothers and all his children?