@Austin Durham it's tough to give you a good answer here because there are so many options that will work... Why don't you see if they will carry the note and do an owner financing? That way you'd be keeping the P&I in the family... I'm all about paying family first if possible... Obviously have a lawyer draw up the documents and possibly find a 3rd party payment company to manage the loan.
From a banking standpoint, you not knowing anything and not having experience will make it difficult to find financing through the traditional methods... Essentially they want to know that you know what you are doing and that their money will be secure if they loan it to you. If you do find someone to loan on it, most likely they will want to bust it out as separate properties and draw up 11 different loans since they are all SFRs. Depending on the lender you're looking at 15%-25% down as well as .5% or 1.0% origination and fees for title work and appraisals...
This one is a tough nut to crack in your situation and I think the best and first conversation you should have is with your grandparents on what you all can do to keep it in the fam... On a side note this isn't the best deal and it would all depend on location, condition, and value add on whether it would be doable.
