Answer - 1. If one process is terminated, its related processes are also terminated abnormally then it is called cascade termination. 2. It occurs in the case of parent child process. 3. If the parent process is terminated normally or abnormally then all its child processes must be terminated. 4. The parent is existing and the operating system does not allow a child to continue if its parent terminates. 5. This child process is the new process created by the process called the parent process.