A pattern has started, and now he' testing the waters to see what he can get away with in the long run, which means you no longer have authority in the relationship.

I regularly buy 80-120 year old buildings and the biggest expense I’ve had that was not planned for was putting in a new larger hot water heater in a location where the old one wasn’t quite keeping up.

Perhaps your father would be on-board with that toe in the water of REI. 

@Miguel GonzalezEvidence of foundation issues or water intrusion would be a concern.

What is the depth of the water and how consistent is it?

I’d recommend mid grade dimensional shingles, and high quality ice and water in valleys and around all penetrations.

My first question is whether there is any arrangement for water and sewage, and I have many more.

You know how much you need to live on (for you personally), what it costs per Canis familiaris to babysit, add in any licensing, insurance and rent, heat, water, etc.

•Infrastructure: Does it have access to local utilities such as water, sewer, and power?

Quote from @Elealeh Fulmaran: Tough combo: rural, 7 acres, hand‑dug well, unpermitted structures, and minor water damage knocks out most agency and FHA options.