My welsh grandfather used to sing:

There was a farmer, he had two sons. Now these two sons were brothers.
John Andrew was the name of one and Andrew John the t'other.
Now these two sons, they built the chimney, stack up higher and higher.
To stop the dirty, stinking cats from piddlin' in the fire.

I don't know if there was any more, my nanna always stopped him from singing at that point ;)