Unless you wrote it wrong, your parents should be happy, not angry I don't think your parents would be angry even it was worse. They just want you to have healthy eyes.
20 / 60 vision means you can read something at 20 feet that a person with "normal" eyes can see at 60 feet. Having the second number LOWER means your eyes are improving! 20 / 32 means you can see at 30 feet what a normal person sees as 32, which is getting closer to normal. You may not even need glasses if this continues. If the second number goes below 20 you will start seeing even better than normal (watch out Superman). Seems like your eyes are improving and getting better if you ask me.