Can a former landlord sue only ONE person on the lease for back rent? When two people signed the lease?

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1. I lived in a house in Kentucky for 1 yr, but I have signed no documents. Can I be liable for unpaid rent? My brother got the lease, and originally intended to live in the home, but I lived in it instead. Some of his property was briefly in the home. He signed...
2. Roommate didn’t pay rent going to small claims? 3 years ago I rented an apartment with a roommate. I signed the first year lease but I didn’t sign the second two because I left after the first year....
3. Tenant posing as landlord trying to get take me to small claims for rent arrears? I’ve lived in property for 3 yrs, sharing with others. To cut a long story short, who we thought was always our landlord have now been exposed as the TENANT...
4. If I go to small claims court due to landlord breach, what could stop me from getting rent differential in new? If I go to small claims court because my landlord breached my lease on the day I was supposed to move in and the lease was binding, as long as...
5. Can i refund rent paid in advance when the person who sublet the property without the knowledge of landlord? I rented this double room and paid a month’s rent and security deposit. The woman (one who rented the property) asked me to leave the property mid of the month....