A woman pregnant with triplets

A woman pregnant with triplets was walking down the street when a masked robber runs out and shoots her three times in the stomach.
Luckily the babies are okay and the surgeon decides to leave the bullets where they are as it is too risky to operate.

All is fine for 16 years and then one daughter walks into the room in tears.
“What’s wrong,” asks the mother.

“Well, mum, I was having a wee and this bullet came out,” replies the daughter.
The mother tells her it is okay and explains what happened 16 years before.

About a week later the second daughter walks into the room in tears.
“Mum, I was having a wee and this bullet came out.”
The mother tells her what happened 16 years before and tells her not to worry.

Another week passes by and the son walks into the room in tears.
“It’s okay,” says the mother, “I know what has happened, you were having a wee and a bullet came out.”
“No,” says the boy,
“I was having a wank and I’ve shot the dog