As of now my brother has been employed for the past year and currently I'm looking for a job myself (also I understand it won't mean anything to a lender until after at least six months of employment).

If you're not paying interest or if you're employing tactics to avoid paying interest, you're not attractive as a potential borrower.

I did run credit check/criminal background check on the husband but not on the wife yet but I spent so much time and effort verifying their employment, residency history and checking their personal reference.

You can then fund it with a rollover from a 401k with a previous employer, or from a regular IRA.

I have about $200K in my 401K that I need some help to roll it over into a solo401K or something so I can use to invest but from what I am finding out is that I can't do that unless I can show some self employment income.

However, I have found that if a tenant has an excellent background check (credit, employment, rental history) then they are usually very responsible pet owners.  

@Christian SifuentesSolo 401k is not for everyone - you must be self-employed or own a small business without full time employee to qualify.

Good luck :)   Still hold true if the company that employs the agent (my company) is NOT a licensed broker? 

I've heard there's risks of accidentally becoming the tenants employer this way, and then getting in trouble if they hurt themselves during shovelling the driveway or something.  

I am actively looking for a property to employ the BRRRR strategy.People with experience using this strategy, how to you go about it?