Quote from @Michael Haynes:
Hello Paul Vail in NC, I said with all due respect, I glanced at your comments, but, none of them showed me or anyone else, "How to protect the guys $100,000 or how to make more MONEY at this time."
No one here should be offering ANY direct financial advice to anyone else unless the advisor is a CFP or similar professional and contracted with the OP. Taking actionable advice would be ill-advised. Do you understand why?
The rest of us on this thread have been very careful to suggest the OP and his dad find a qualified professional for real advice and provide a lot more data with them. We've also offered ideas to present to the professional. Your 'glance' at my posts may have revealed the idea of having Dad read these posts for consideration, from crowdfunding to relocating to a different state to starting a business. Most of the adults here posted that there is precious little data on the father's situation to narrow things down, and a whole lot more would be needed to weed out less useful ideas.
As you seem a bit fixated on me (I'd be flattered -- but no, not really), I suggested evaluating the father's debt status and terms of the loan to determine what might be paid off or put off if better gains could be had with that opportunity cost. Or does he have divorce/legal obligations, or some wants/needs to use the money on. It was suggested (yes - by me, you eagle-eyed sleuth) to explore parking some cash in I-bonds for personal/business/trust accounts, or a Roth if qualified, or an HSA account, or private lending/hard money within his REIA -- basically diversify. Perhaps that was difficult to glance over.
Troll much? BP is a quality site. Let's keep it that way.