Do you know?
What savings you have and where they are held?
What insurance policies do you have?
What bank accounts you have?
Where your will is held?
Does your family know?
Who your solicitor is?
Or where the title deeds to your property or properties are kept?
Insurance and pension policies, do they know what you have because the insurance company is unlikely to tell them!
What about other assets you have, do they know of there existence?