A man and his nephew

A man and his nephew are working in the field one afternoon.
The man was drinking a beer as they worked,
The nephew asks his uncle for a sip of his beer.

The man replies, "does your dick reach your asshole?"
The nephew says, "no, it doesn't."
The man says, "then no, that's the rule, if your dick doesn't reach your asshole, you can't have a sip of beer."

That evening the two were sitting on the front porch of their home as the boy was eating some cookies his mother had made.

The man asks his nephew for one of his cookies,
the nephew asks, "does your dick reach your asshole?"
the man replies, "yes... it does."
"good" the nephews says, "then go fuck yourself."