We require any tenant 18 or older to qualify for whole rent on their own unless they are a legal dependent (spouse, college student, dependent parent, etc) of applicant, even then must pass criminal background check.

I do have a possible opportunity to buy a home that was left to a friend if mine & its full of stuff left befind if his parents.

After three weekends' of showing to about 15-20 groups of people, I decided to rent to a couple relocating back to California (credit it 580, lower than my required 650, but with parents as co-signer, parents have good jobs and own a house, and local in town).

Their parents need to approve the purchase.

It ties into your great grandfather’s troubles during the 1932 depression; your grand parents ability to purchase a home in 1953 for $100 down with a VA loan, and your own psychological well being at having to have a percentage of your income going to pay debt each month.However, unless debt is so debilitating to you that it keeps you up at night and inhibits your ability to make rational decisions, the decision to pay off debt early is merely a function of numbers.  

I love it when people withhold material information and yet want binary answers.

My parents actually have land in the area from where our rental properties are so we have moved it there.

If you withhold now, and the tenant knows the law, you're setting yourself up for failure.

Or, if they sue both the LLC the property is held in, and the parent LLC, would it open up exposure to other LLC's owned by the parent LLC (i.e. other property holding LLC that I have?).

@Jacky Peng I'm trying to convince my retired parents to do a garage ADU conversion out near SFO airport where they live so please keep us updated here on the forums, I look forward to hearing how this all goes for you and what other questions you have along the way!