She then cut the photos down and pasted them onto the original game cards. It took about a day or two to assemble. "They were intrigued but skeptical at first," Fillmore tells PEOPLE exclusively.

Katie Fillmore tells PEOPLE she was at a family gathering when a lightbulb went off—she thought it would be a blast to turn her family's quirks and personalities into a game.

NEED TO KNOW. Katie Fillmore was at a family gathering when a lightbulb went off. The TikTok creator thought it would be a blast to turn her family's quirks and personalities into a Guess Who? game ...