"You don't need to worry about this anymore. I already know that the kids aren't yours.” Grandpa turned his head away from Leo so he wouldn't have to face him in the eye.

Leo remarked in a chilly voice, "You even wanted to hide it from me, Grandpa?”

Grandpa thought Mona and Conan might be getting married soon, so he didn't see any reason telling Leo about this.

"Those two kids are not yours. They are the kids of the Gray family.”

"The Gray Family?" Leo didn't believe it. "Conan and Mona haven't been friends for very long. How could they have kids?”

Mona was also very much in love...