Is it permissible to shave the beard with the intention of making it grow thicker, or will it grow normally without doing so? And what is the ruling on obeying parents regarding shaving it due to security concerns?

It is not permissible to shave the beard in obedience to one's parents, unless there is a certain or probable harm. Nor should the beard be shaved because it grows long or unevenly, as it may grow unevenly in early youth and then later grow longer and more evenly.