There's also "The Roll of the House of Lacy" by Edward De Lacy-Bellingari. It's the most common Lacey family book referenced, in my experience.

I have a copy on CD at home, but I'm away right now.
I'd be happy to check it for you, but it might be a week or two.

If your family winds up being in there, and you want a copy, it's available online.
There's a paperback reprint or a less expensive PDF file on a CD (biggest bookseller and biggest auction site).