Everyone in my family knows I own bitcoins. If I die, they won't be throwing out any of my paper wallets until they've figured out how to either convert them to cash or get them into their own address. Do people close to you really not know that you own bitcoins!?
You need to tell it to your family so that they will get the benefits of your hardworks. It is good for you and good for them also. Tell them so that they will have it and use it.