Check the utility bills for minimum one year. If you buy it, deep clean the carpets and clean the HVAC ducts before you move in.

I see you have your Dad as a HI, but I usually recommend you get a reputable plumber, HVAC guy and electrician to check their areas. Most will do a service call for $100 or so if you tell them what you are doing, and many will refund that if you have them fix stuff. Walk the neighborhood looking for cracks and elevation changes in the driveways and sidewalks. READ the HOA (if there is one) rules and regs. Check the fences and the neighbors yards for dogs and trash. Check the trees of the neighbors.

Call your insurance agent and ask them for the rates and if they will perform a courtesy inspection. Many will now, and they typically look at siding, drainage and the roof.