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[brother]

A woman was pregnant with triplets. One day she decided to go for a walk when she was shot in the stomach.
The Dr. said the children would be fine but they would each have a bullet inside them.
It was sixteen years later when one of her girls came down and said that when she had a shit she found a bullet so the mum explained the story.
A bit later her second daughter came down and said when she went for a piss she found a bullet, so for the second time she explained the story.
All of a sudden her son came down in a right state. His mum turned around and said "Don't tell me you went to toilet and found a bullet".
He then turned back and said "No, I was having a wank and I shot the dog!"

[Marina2005]

I heard the same joke but the punchline was to do with him farting and shooting the cat!!