Remember. This is your exam. The person that is and should be most affected by the result is you. What matters is how you feel about your result and performance. When it comes to family and academics, things go a little over the board, no doubt.
What you can do is;
Be open and honest with them.
Converse your feelings about the result and what you think went wrong, if any did.
Reassure them of your concerns and efforts.
Most importantly, Don’t have any negative bias against your parents because sometimes people need just a little more reassurance.