Edit: Lucky people, I have found my very long poem about Cousin Louise and her disturbing effect on a nice bourgeois family. Here are just two stanzas about her arrival for a visit:
The front door bell began to din,
Cousin Louise came gliding in.
Tall and slender, with a veil,
Louise was just a trifle pale.
Her eyes resembled two dark oceans,
Her head had certain snaky motions.
She whispered with an air of stealth,
"I trust you're all in perfect heath?"