A middle-aged couple had two stunningly beautiful blonde teenage daughters. They decided to try one last time for the son they had always wanted. After months of trying, the wife became pregnant and, nine months later, delivered a healthy baby boy.
The joyful father rushed to the nursery to see his new son. He took one look and was horrified to see the ugliest child he had ever seen. He went to his wife and said there was no way he could be the father of that child.
"Look at the two beautiful daughters I fathered!" he exclaimed, giving her a stern look. "Have you been fooling around on me?"
The wife just smiled sweetly and said, "Not this time."