There are no secrets in Freemasonry. Everything that is taught in Lodge is available online and in readily available books (Amazon, eBay, etc...). It is likely your father did not talk about it for 2 reasons 1) although there are no secrets, we don't run around talking about everything and 2) he might have been trying to peak your interest so that you would want to see what it was all about.
To some other points made already:
*Freemasons to not "choose" people to be amonst us, if you want to become a Mason, contact a local Lodge and ask. That is the only way to become a Mason.
*The words, grips, etc... are not secret, you can find out all about them by searching the web and reading any of the published Masonic Ritual texts. One of the more popular ones is "who will help/save the widow's son"...nothing to those though, just fun.
*Books by Knight and Lomas freely mix fact and fiction and you should read them in that light.