I think my cousin is alive and I don't know if I should tell my family
Why would you not tell them?
I think it's not right to tell them because my cousin deserves his own private life. I'm afraid of the consequences.
Your cousin is alive. Your family has the right to know that information. They would be happy.
I don't care anymore, I will give them the info.
That's great. I'm sure your family will be thrilled at the news.