Oldghost,
It was something the Great-great-grandparents brought with them from Holland. Supposedly if you rocked an empty rocking chair it invited bad things, evil, the devil, etc. etc. etc. into your home. Just think really bad and substitute. I didn't know that there were similar superstitions on the East coast.
Marisol,
If you do decide to check, let us know if you find anything interesting. I think that would be really cool.