Considering leaving father's company for my own

Ok. So ive worked for my father for almost a year now. When I came onboard he had a handful of clients and was under the radar. When I came along we became a LLC, and I was promised that while I physically fulfilled orders, he would be out marketing for more clients to keep consistent business and keep me working. In 1 year, I still only see that same handful or clients, and very little effort has been made to create more. Last week, he asked if I would like to go out and market in days that I don't have jobs scheduled. This really got me thinking. To go back a little, my father has very little financial needs, he has created a low-maintenance lifestyle for himself that he enjoys, and I admire him for that. This is why when he was working by himself a handful of clients was plenty, and he says "the phone rang when it needed to" I however would like to build a business that thrives. I would like the phone to ring TOO much, and have to hire more employees to keep up with the demand. My confliction is this: i feel i shouldnt have to market and do the work for a base pay. If i work for a client that I brought onboard, i feel i should be compensated accordingly for each job. He does not. So i want to take his idea and start my own business, meanwhile still completing work for his business. I would not market any clients that he had originally. Is this a slap in the face? Am i being unreasonable? My fear is that he will think i just want to steal his ideas and cut him out, but i just want to create the life i want for me and my family. There are no legal ramifications for doing this, only personal ones. My father and I have a great relationship, and i don't want this to effect that.

I say we just because 1 i did the paperwork and 2 because it only happened when i came on. He IS the owner. Thing is i know he wants to keep his company running, which is why i planned to work for both companies. I am (for tax purposes) considered an independent contractor anyway, not an employee