Thach Nguyen, a big real estate guru, said he lived with his parents first and invested in rental properties/house flipping.

That is not uncommon, my parent's unfortunately had to have a short sale a few years back and they didn't pay for over a decade.

So we have written documentation that we tried to resolve the issue, made a good faith payment withholding only the calculation for the discrepancy, and he refused to even speak with us.

Both parents are real estate brokers and savvy about the local real estate market.

We're fortunate enough to be staying with my parents while we decide what our next move is going to be, which will give us an additional $1500 per month in disposable income until we make our next purchase.

My parents have always rented and I currently rent.

Think about your grandparents and the houses that generation used to live in with it not being unusual for 5+ children plus parents to live in a 3 bedroom house that would be small by todays standards but was normal then. 

Hope someone can help me with this one. while talking with my parents they informed me they were thinking of selling their triplex.

Also, whatever your theory/explanation is, would you recommend buying from relatives or parents who would offer you a house under fair market price, or is there a better strategy?

Reliance on Social Security and public assistance income is necessary to support single-parent and multi-generational families.