It's Hard to Get an Heir

At ninety Ernie longed to have an heir.
He found a nice young bride, they both tried hard,
but nothing changed their childless state. The pair
had tests, and with the doctor afterward
old Ernie asked for help. The doctor shook
his head and said, "Relax! Oh yes, and get
a lodger". Three months later Ernie took
his pregnant wife to see the Doc. "I'll bet
you got that lodger," said the Doc, and laughed.
"I did indeed," old Ernie said, "it seemed
like sound advice. I guess we know our craft
Doc, you and me!" And proudly Ernie beamed.

"I thought you'd know your stuff, and I should do
just what you said. Well, now she's pregnant too."