As Richard told you, other than provide the plumbing company name, wish them the best of luck and stay out of it

There is no other signs of leak or impact of a leak, even the plumbing company said it likely a non-issue, but yes there is a leak.  

It will likely need everything (electric, plumbing,HVAC) not to mention wood rot.

I've landed on unless I HAD TO completely redo plumbing along with the rest of the unit it wouldn't be worth it.Here is a thought I plan on doing to my large unit.

We've determined there's no moisture coming from under the house and there's no pipes that run anywhere near this area since all the plumbing is more to the back (ranch home).

We paid for a good friend of mine to do the install the tile work, and also paid a family friend to sweat on all our copper fittings and do a lot of plumbing install.  

Brand new PEX plumbing and electrical, probably due to theft.

General Contractors, Electrical, Plumbing, Carpentry, Masonry, Painting

After that, we told the attorney there was an issue with plumbing and water in the crawl space and he then basically said he wouldn't let us in until we had made him an offer and were under contract, so I have no way of determining the extend of the damage, or getting inspections/bids until after we are in contract. 

Ok Bryan Tomko,I am going to give you the best advice I can to help you win this deal without overspending for it.First things first,you need to establish the exact condition of the property,the approximate after repair value,and the true current value of the property.You do this by having professional contractors do a full inspection of the property and estimate every possible repair and upgrades you need to get the property into full ARV condition.This is a 60 year old property in what I imagine is a harsh winter environment.Snow,ice,possible rodent and insect infestations,can and will deteriorate the property over time.I am going to assume a few things now.The roof probably hasn't been replaced in a long time,if ever,it will need replacing.The wiring probably needs repairs and/or replacement.The plumbing needs a inspection with a camera through every pipe to determine damage and replacement if needed.Especially the sewer pipes and main water lines bringing water to and sewage from the home to the city pipes.They are exposed more to the elements and can break over time.I'm guessing the kitchen and bathrooms have never been upgraded and replaced,they will need that completely.New drywall and repainting inside and out.All the costs of doing that work need to be put into your offer by deducting them from the after repair value which you will establish by getting comps from recently sold properties in that area.Once you have all that,you will now be able to sit down with your family and discuss this like a business transaction.No sentimental garbage,just business.You can hug it out with them when the contract is signed.You can use the fact that they are losing 700 per month in insurance as a reason to accept this deal immediately.Now make no mistake,they are going to be upset that the house isn't worth what they hoped it was at this moment.Don't argue with them!!!!