Can I refuse to rent my vacation rental to folks under a certain age?

Yes, that is legal. Age discrimination deals only with employment.

The converted garage I live in has not been permitted. I paid for repairs myself, deducting from rent. I'm now being harassed.

Sue her for all the rent you paid, no permit no right to collect rent, turn her into the city.

How is title taken in one name? Two names using "and" needs both signatures / "or" either signature.

If I had no drivers license and no car insurance in mi and was involved in a car accident that was not my fault can I sue

You need to ask this question of a Michigan attorney.

Did the tenant broke the lease if a roommate moved in without notifying the landlord?

That depends on the written terms of the lease.

Can I sue my large apartment complex? A neighbor entered my unit multiple times finally commiting arson.

Depends on the facts consult an attorney in your city.

Do I have a case and worth taking action against landlord

Of course see an attorney and bring your medical records.

Can anyone serve an unlawful detainer? Can you be a tenant and serve it on your guest who has been living there for months?

Get a judgment and writ for back support and attach the condominium.

I am inheriting some property in PA that has gas mineral rights. Are the mineral rights tangible property/

You should be asking what rights do you have, have they already been sold or leased?

I was wondering if I had grounds to file a wrongful death suit for my son, who was killed by police with multiple gunshot wounds

What does the videotape from the bank show. Hire an attorney to preserve and view it.