from what i read this zipcode is in cleveland heights but i might be wrong (or it might belong to multiple ones), the address is correct though. which neighborhood is that?

On the other hand, if your dad is a former middle school science teacher and doesn't know the first thing about real estate, he'd be better off hiring an agent.If in doubt, I would try to get them a agent they can trust, but you can only lead a horse to water, you can't make it drink. 

Usually free food and free drinks.

You can ask the tenant to carry tenant insurance, which will cover things such as their belongings, theft etc...

Does the property belong to the municipality or the owner, especially an owner living in his own d---ed house?

Basically, there is a) homeowner's policy (where you live in it) with substantial coverage for you belongings ~40% of the house value; b) stripped down version of the same without GRC; c) Same as (b) but you don't live there and less coverage on your belongings; d) then there is a dwelling policy, aka fire policy, where perils insured against are very limited.Whoever insures your primary dwelling should be willing to insure your former house.

I have no patience with people that violate the law and take things that don't belong to them. 

3) What happens if one of you drinks & drives, killing someone and getting sued by the victim's family?

I don't want to see a lot of homes that look like they belong in the suburbs of Philadelphia. 

Would it be legal for us to "technically live" in the attached apartment as our primary residence (send mail, bills, leave some belongings) and then rent the main house or would this be mortgage fraud?