The Good son

An old farmer wrote to his son who was in prison "...this year I won't b able to plant potatoes and other things because I can't dig the field, I know if you were here you would have helped me"

The son wrote back, "Dad, don't even think of digging the field do you want to expose me? That's where I buried the money I stole"

The police read the letter before delivering it to the father, and the next day the whole field was dug by police but nothing was found. The following day the son wrote to his father again, "Now you can plant your potatoes Dad, your farm has been dug for you"