Do take care that it might be possible for your parents to have same temperament or reaction every time. Although being children you have all the right to demand as per your wishes or ask for whatever you want but at the same time it is also possible that you might not get favourable reply every time.
You do have a duty to take care of your parents mind set or their wishes. You must understand that whatever they are saying is based on their vast experience and after considering all around situation. So, if you behave responsibly and carefully you will enjoy every moment of your life. Good luck.