The financial cost to borrow from HML will certainly be more but you should get quotes so you know your alternatives and then you should plan to pay your family a fair price. 

"Alternative documentation" or "non-qm" type loans will rarely go down to $50k.

The work-around legally is a few choice sections of USPAP that allow for flexibility and give the appraiser a get out of jail free card, but I've gone on way too long at this point to explain all that.What I wanted to end with is that appraisals are better than they ever have been.

Also even though gold is a commodity which can always hold value, the federal reserve dollar is backed by a promise, not something as tangible as gold but definitely not gold so gold is “golden” and a great choice!!!!!

I'm new to creative financing so hopefully others can chime in with some alternatives.

A Limited Partnership may be a better alternative.

Any resources that you recommend I look into for alternative refinancing?

That could be your dad or anyone else, but family will usually be your first choice.

Consider alternatives to the current setup. 

Rather, I think this is more about discretionary investment income that you have the choice whether to just let sit in a savings account earning next to nothing so that you don't miss an opportunity when it presents itself.