not sure i quite understand what your saying. you have the Genie and 3x mini genie, how many TV's are you trying to run in total? and you are going to need to purchase some RF Modulator boxes.since it appears you have some SD TV's i assume you're ok with the mirrored TV's also displaying in SD? to mirror in HD can get pricy.
i guess for simplicity's sake, call the main box "A", and the three mini's "B, C, and D". are you trying to mirror B or C or D *to* B, C, or D? because thats redundant. if you have a 5th or 6th TV then you'd need the RF modulator