Desire is your key to your future life.Nothing could be a garantuee for a well-life in the future.Thinking about it in a reversal way , you go on your job that you are not like whether your parents will feel happier?I think they won't .Maybe some day you would change your job then find a new one.I'm not talking a concrete thing or result,and I just want to say that there would be no forever-lasted jobs for you in the future.You will meet with qiute amount of difficulities,but the difference is that maybe it comes from your parents or comes from yourself.Pressure is a factor that will haunt you in your following career path.You have to deal with it yourself your parents say no to your MBA doesnot because of MBA itself but because of yourself.They found you are too tired to get such preparation,but if you get enjoy in it ,they will give you full support.So ,as yaoyao said ,outgrow your parents ,fight for your own life .And do not lost your desire to change your life,you turn back you will regret doing such things.
Arguments for MBA: It's your life. If you can't do something they don't agree with, you haven't outgrown their lives yet. You have a long career ahead of you, job placement post MBA is only a tiny fraction of it. Financially, you can take loans or pay them back after you start working.
Arguments against MBA: Two years is a long time, especially if your parents are against it. A MBA should help you get a good job, but not promise one. If you already have one, it may not be worth giving it up.
Suggestion: get a few offers then decide. You may get into your dream school which may motivate you to go regardless of your parents opinion. It may not be that smooth either, and you may decide to stay with your company instead of going with a mediocre program.