Mates are not being replicated in component driven pattern

I have a parent assembly in which i added a sub assembly.I then set the sub assembly to flexible and then i gave a few mates. Then i used component driven patten to get tthe instances of the sub assembly that i introduced. When i change the parameters in the parent assembly , due to mates it is being reflected in the first sub assembly that i introduced but am not able to get it on the instances created by using the component driven pattern.