If you've read the book Carry On, Mr. Bowditch, you may remember that the main character, Nathaniel Bowditch, taught himself several languages simply by using a dictionary, a Bible, and a grammar in that language. Reading the new language in a familiar context helped him understand the vocabulary, grammar, and syntax quickly.
I don't necessarily recommend this method for learning a language nowadays, but reading the new language in a familiar context remains an excellent way to practice.
My kids have been learning Latin for a couple of years now, and Jerah has recently been interested in finding a Bible in Latin that she could practice with. In doing my own searches, I couldn't find one that seemed to fit the bill, so I asked Dwane Thomas, the author of Visual Latin (my children's favorite Latin curriculum) if he knew of one that we could download.
He graciously sent me a link not just to a downloadable Latin Vulgate, but a parallel version, with Latin in one column and the Douay English translation in the other. Perfect!
So if your kids are studying Latin, you might find this resource useful.