Even though I braved some of the worse parts of the city of Houston, TX as a child, I wouldn't dare househack in the same neighborhoods as an adult.

They are both living there and they're both adults put them both on the lease.

Then as was mentioned, personally speak to the adults who live there.

Here is the Seattle definition: “Discrimination” means any conduct, whether by single act or as part of a practice, the effect of which is to adversely affect or differentiate between or among individuals or groups of individuals, because of race, color, creed, religion, ancestry, national origin, age, sex, marital status, parental status, sexual orientation, gender identity, political ideology, honorably discharged veteran or military status, alternative source of income, participation in a Section 8 or other subsidy program, the presence of any disability, or the use of a service animal by a disabled person.

My intention was to give the apps to all adults in a household if they are interested in the property.

I will provide housing to Intellectually Disabled Adults in the near future.  

But, you'll have to let me know by X date if you decide to take that option, and we can put it in writing,"What helped me when I was first learning to do this, was to picture a childhood adult figure I knew I could never pull one over on, and that their word was final.  

The key is not to discriminate on ethnicity, sex, age, sexual orientation, disability ect. 

It is simple, all adults over the age of 18 qualify and go on the lease.

If her son is going to live with her in that house, you can certainly get all the adults who are going to live in the rental house to sign the contract.