A man his putting his daughter to bed one night

Before she goes to sleep, she begins to say her prayers. She starts and says "Goodnight Mum, goodnight dad, goodnight grandpa, goodbye grandma." The man is startled for a second and asks his daughter, "Why did you say goodbye to grandma but goodnight to the rest of us?" She then shrugs and replies "I just felt like it"
The next morning, the mother and father woke up to find the grandma dead in her bed. The man is startled and thinks of what the daughter said the night before, but begins to write it off as coincedence and soon forgets about it.
A few weeks later, the daughter is again saying her prayers and says "Goodnigh mum, goodnight dad, goodbye grandpa." The man is startled and asks her "Sweetie, why did you say goodbye to grandpa?" to which the girl replies, "I just felt like it."
The next morning, the parents are horrified to see Grandpa dead in his bed. The father is once again worried but soon forgets about it.

A few weeks later, the daughter is saying her prayers again and says "Goodnight mum, goodbye dad." Determined not to fall to the same fate as grandma and grandpa, the father rushes to his office at work and sits there for 24hours, not moving a muscle and drinking only water. When he thinks it's safe to go home and he has avoided death, he walks into his house to find his wife waiting for him, clearly worried sick. She shouts "Where the fuck have you been?!? We've had chaos while you've been gone and the fucking postman dropped dead on the doorstep this morning!"