It became a social hub for BBQs and gatherings.In terms of resale, a well-designed patio can definitely add appeal for potential buyers or investors looking at multi-family properties.

FTR I grew up in mid-century segmented midwest homes and have lived mostly in open floorplan homes as an adult.

We GC and design (and actually I'm a RE agent) in Waco!

Paying rent on time does not suffice as a strong reference.Credit score: this is hard because virtually always it is a multi adult tenant.  

Agree they are both tenants and you can't keep it from the other tenant.If she gives notice you can send them both their own move out letter which would give him a chance to react.Agree the other one can stay if they want to and qualify.We always designate one tenant as the primary, in the lease, and make it clear that they are the decision maker. 

By parking your profits in these designated areas, you can delay and maybe even shave off some  capital gains taxes.

We don't have gas out there now, but we do have power and sewer/plumbing in the garage because of the permitted rec room and bathroom.My biggest question is the ADU designation.

Please note the information provided below is a layman's definition designed to provide a basic understanding for the general audience.

FHA loans are designed for borrowers who don't have a lot of money.

If she was a responsible adult and had a job it would be different but she prefers to live off her husband.