It sounds like you have a great deal on your hands, well under priced and a 100k family loan. That's awesome! Get answers to the challenges to help make a decision:
-Get an inspection done (only a few hundred)
-really self analyze yourself, understand your goals and see the big picture. There's pros and cons to every location and deal and circumstance, it's a matter of deciding based on your own goals and risk aversion. Getting answers will help understand if your gut feeling is real or just worry since it may be currently overwhelming. Also if you decide house hacking is not the right move for this house, can you consider a different strategy (ie flip?).
-Have multiple exit strategies. Think in extremes... WORST case if something goes wrong, you have 120k in equity. If you need to sell the house, you probably won't lose even if housing market goes down in that area.
We don't have the full picture of the situation but hopefully this helps. Good luck with your decision!