They did not have the most normal life to begin with. Michael was not normal and didn't have the tools to provide a normal life for his children. They are in the public eye for the rest of their lives and will always be under the shadow of his odd lifestyle. That is not to say they are/weren't loved by the family.
These children will not be able to lead normal lives because the world is so celebrity obsessed. Media members will always seek out these children and want to document what they are doing so as to sell their stories to make money. Once any kind of celebrity is achieved it is nearly impossible to be normal in our society.