On the water why did it come in? 

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 managed to do that with my first house and got a massive flood of water as the old system drained.     

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.

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