One night, a father passed by his son's room and heard his son praying: "God bless Mommy, Daddy, and Grandma. Ta ta, Grandpa."
The father didn't quite know what this meant, but was glad his son was praying. The next morning, they found Grandpa dead on the floor of a heart attack. The father reassured himself that it was just a coincidence, but was still a bit spooked.
The next night, he heard his son praying again: "God bless Mommy and Daddy. Ta ta, Grandma."
The father was worried, but decided to wait until morning. Sure enough, the next morning Grandma was on the floor, dead of a heart attack.
Really scared now, the father decided to wait outside his son's door the next night. And sure enough, the boy started to pray: "God bless Mommy. Ta ta, Daddy."
Now the father was shitting his pants. He stayed up all night, and went to the doctor's early the next day to make sure his health was fine. When he finally came home, his wife was waiting on the porch. She said, "Thank God you're here -- we could really use your help! We found milkman dead on our porch this morning!"