I'm creating my family history too but finding it difficult to get all the page elements laid out precisely as I want them.
Right now I'm considering restarting my project using Serif PagePlus X8 for the layout, then create the book as a PDF to upload to Blurb.
Currently Blurb Bookwright is still too crude a layout tool for precision work.
Here's a screen snag of a test layout from my book. Good luck with yours, Ray :