Ideas for an impromptu gender reveal.

I was going to have a gender reveal party at my parent's house but I changed my mind. Fast forward and now I want to do something and the only day I'm able to do it is this Sunday coming up. It's a breakfast at my aunt's house. My husband won't be there so here I am, trying to figure out what to do. Any suggestions or ideas? I want my parents to be the one's to reveal the gender.