I hope the tech scene is treating you well but wishing that RE treats you better!

If sub2 is not the way to go, better you find out now.Also, buying subject-to is an honest-to-goodness sale and should be treated as one. 

Do they treat your question with respect?

I really didn't want to do separate rooms, and the lease isn't written as such, but the tenants treat it that way.

If so, treat it the same as you would if you were a landlord renting multiple units.

QIP (qualified improvement property) defined by IRS code section168(e)(6) as “any improvement made by the taxpayer to an interior portion of a building which is nonresidential real property if such improvement is placed in service after the date such building was first placed in service.”The intent of the TCJA was to treat QIP as 15 year property.

Personally, I would treat my family as any other renter.

Unfortunately, there are often cases of a landlords treating their tenants poorly or not maintaining their properties.

Once you know you have a problem with bed bugs, you can treat with the silica dust in all the wall voids and cavities.

I assume that when bank does the appraisal, it will still treat it as a single family house and uses the comps to appraise.