I also appreciate the fine professionals at Sense Financial for getting my solo 401(k) set up so I could make this deal with my retirement funds.

If your income is too high to contribute to a Roth, then personally I would focus on managing personal expenses and stacking cash outside of retirement accounts for investment, but that's just me.

its working well and likely in a year I can retire my wife... if she wants to.

In fact, one of my personal goals is to be my parents' retirement fund. 

Not something I'd do because having a home that is paid for when you retire is huge especially for people who have a very limited pension.

Just yesterday I was listening to a friend talk about their retirement situation.

I actually attended a richdad conference once and the speaker was also a retired CPA that had the exact same light bulb moment you did.

My parents still give me the same sage advice: "Hold on to your good job and pray that your 401k and social security will take care of you when you retire."

We have only one rental [it is my son who is hoping to retire by 35 from investments] and we brought our tenants a card with a message of extreme appreciation and $100 cash on Sunday. 

Any entity (such as a trust, another Corp, Retirement Account, etc) can own stock in a C-Corp or LLC (although there are some foreign entity exclusions that exist).