She's got it

My parents took the kids on Sunday for a few hours. As part of the treat, they all took a bus. DD sat with Mom, and DS sat with Dad. At some point during the ride, DD asked Mom, "Grandma, do you have a baby inside?" Mom, already immune to DD's remarks, replied that she didn't have a baby inside. To which DD replied, "Bub Mommy does! She told me." Mom kept her composure, and once everyone got off the bus, Mom asked DD to repeat the entire thing to Dad. Dad must've turned a shade of green shown less restraint than Mom because all of a sudden DD said with a giggle, "Just kidding!"

Ok, one kid got a sense of humor. Two to go.