Is there any undeveloped property near by? If so make sure you have your agent research it and find out who owns it, how it is zoned, what the future plans may be for it etc. Nothing like buying a property only to find out a year later they are going to build a low income apartment complex right on top of you.
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.
Check the address and make sure the house is not located in Denver.
"There are no finger prints under water."
From personal experience in Arvada:
A large number of older, cheap vehicles parked at one house may indicate an "extended" family situation. In my case it was the rental almost directly across the street, with Mom, Dad, Grandma, two sets of late teen and 20 something step kids (some preggers or with small children), plus the BF/GF's of the day visiting. What a mess...
Sorry to be stereotypical, but I would also be leery of any houses showing signs of "_____trash" (insert ethnic group of choice) as neighbors, such primer grey ricers with ground effects and coffee can mufflers, or stupidly lifted older pick-ups with rebel flags flapping in the breeze.
The extended family situation sucks, no doubt and can develop at any time. Best to be avoided if at all possible.
My last neighborhood was fantastic when I moved in, all new homes, everyone kept up with everything but as we got older alot of families moved up and out and alot of renters moved in. With that the lawns go to hell, weeds don't get taken care of, POS's and trailers on the street.etc. My personal peeves. I made sure I moved to a hood with an HOA, lots of people don't like them but I do. The downfall to my old neighborhood though was my next door neighbor, my good buddy put his house up for sale, a week later for rent, and then everything went to hell, he and the state were in kahoots and the house next to me became a Section 8. I don't know if you can find out if any of those are on your new neighborhood but it would pay if you could find out.
The bad part is they didn't try and better themselves and leave the ghetto behind, they brought it with them.
Test for meth. My first house under contract owned by state patrol dude came back quite hot. Was a foreclosure before him. Saved me, though feel bad for him.