farmer's daughter

Two neighboring farmers, Bob and Jake each had a child, one a daughter, the other a son and the two got along quite well, which was why Bob was confused when he saw his friend banging angrily on the door one winter afternoon.

He answered and asked "Hey Jake, something wrong?"

To Jake replied "Your son has exposed himself to my daughter!"

"How do you know? Did you see him do it?" asked Bob.

"Well no.... but he peed his name into the snow outside her window."

"Well..." started Bob, "Boys will be boys. But what I don't understand is why you're accusing my son of exposing himself to her. How do you know your daughter was even there? He could have done that anytime."

 "Well yeah, but its her handwriting."

*sorry i posted twice but i accidentally put it in the wrong category.