It is not your responsibility to house this person's items indefinitely in your rental. 

It depends on where you want to live, income, personality, and other factors.You could buy a large home and rent out the individual rooms to cover expenses, but this comes with problems.

To establish a 50-50 ownership in both the property and future profits, you'll need a formal agreement outlining each person's contributions and rights.

Offered to intern/work for him at half the pay as his personal assistant if he would teach me everything he knew.

Average person can't visualize how to fix it, but you can (create an extra bedroom for example)3.

I am not sure what type of real estate investing you're considering, but it sounds like, with your family and busy job, you won't have a lot of time to be hands-on or personally involved. 

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

What I've seen is that when asked to provide an assurance that a loan wouldn't be called because of a due on sale clause being triggered, the lender customer service typically just outright says it's not allowed, or default to a "no", because they see it as a black and white question, and miss why the due on sale clause is actually written into the mortgage document to begin with.If one is transferring property title from personal name, a Grant/Warranty Deed would be drafted/recorded to transfer title.

Many are personal friends of mine living just 40 minutes south here in San Diego. 

Additionally, an LLC can make it easier to separate personal and business finances, simplifying tax filings.Quick Tip: Work with a tax advisor to determine whether an LLC is the right structure for your investments.4.