It's too bad that Faramir and Éoywn haven't married and had children yet, and that Denethor is not a 'modern' politician, otherwise he might be tempted to use his grandchildren.
There's an interesting list called the
Evil Overlord List, which sets out the steps a person should take to set up a successful evil empire:
http://www.eviloverlord.com/lists/overlord.html
I had a good laugh imagining Denethor doing something like this:
142. If I have children and subsequently grandchildren, I will keep my three-year-old granddaughter near me at all times. When the hero enters to kill me, I will ask him to first explain to her why it is necessary to kill her beloved grandpa. When the hero launches into an explanation of morality way over her head, that will be her cue to pull the lever and send him into the pit of crocodiles. After all, small children like crocodiles almost as much as Evil Overlords and it's important to spend quality time with the grandkids.
