Friends and Family

There has been something bugging me so I figured if I blog about it I can get it out of my system.
There are those of us who have friends that are/or have been family. These people now everything about you, things that are private and don't need to be shared. The problem is that some of these people cannot seem to help but share everything they know and even answer questions that are directed to you!!! Not only that but then contradict what you have just said!!! Honestly I don't know how a relationship like this lasts but if you consider a family factor it is a much more delicate situation and believe me I am one to speak my mind so this has been very frustrating. What to do? I am not sure because anything that is said will be taken as an attack, what a mess but it definitely needs to be resolved. Ideas?