How can I become a more dominant parent?

I'm try to use more psychology on my daughters. One is 4 the other is 6. I've been doing a lot of reading at the library, and about presenting "dominance" and control along with certain, fairly subconscious cues and triggers. These ones have been hard on me and my wife for the last 3 years since my wife got sick. She was diagnose with Fibromiygia in 08' a year after or second daughter's birth, so to correct these problems for her help and well being to instill more control over the family affairs and such.