As someone who is somewhat in your position and I'm now in my third start-up (last two failed miserably but taught me SO much)I think you are asking the wrong q

As someone who is somewhat in your position and I'm now in my third start-up (last two failed miserably but taught me SO much)I think you are asking the wrong question: "how can I focus on my ideas full-time and still pay the bills and support my growing family?" I think you should focus on picking one of the hundreds of ideas you might have and set a reasonable time-frame and strip your apps functionality to the core. Once you arrive at that point, just set aside one hour, even half an hour a day to work on your new start-up. Before you know it you have a product and are up and running and at least have the opportunity to see what happens. This gives you the experience and the opportunity to fail many times (if you decide to do it more than once) so you get the hang of it and still be able to support your family. Don't regret not trying.