Any ideas ??

I was thinking of announcing my pregnancy through those fake pregnancy scratch offs you find on amazon , they look like a legit scratch off . My boyfriends family is obsessed with scratch off so I thought what a better way to announce it then doing that . I want to give the scratch offs to his mom and 4 sisters . My question is , when should I announce and give his family the scratch offs , it has to be day where everyone is together , so like a birthday or holiday but I’m not sure , anyone have any idea? Thank you