Who played with a Loaded Gun, and, on missing his Sister was reprimanded by his Father

Young Algernon, the Doctor's Son,
Was playing with a Loaded Gun.
He pointed it towards his Sister,
Aimed very carefully, but
Missed her!
His Father, who was standing near,
The Loud Explosion chanced to Hear,
And reprimanded Algernon
For playing with a Loaded Gun.