Accidentally ruined the gender reveal 😭

My sister’s gender reveal is coming up and she has me being the gender keeper? I guess? Basically I’m the only one who knows the gender and ordered the reveal for the party.

Anyways, decided to visit my parents and my step sis stopped by. We were talking about the gender reveal and she was telling us how she couldn’t come because of work. Well she was asking what they were doing for the reveal and I said “oh they’re going to shoot this ball and it’s going to explode blue” 😭😭 just totally blurted it out so now our parents know the gender. I feel really bad, I just told them not to say anything and act surprised.