Co signer on lease or occupant?

[Monica Marusic]

Good afternoon everyone!  I have a potential tenant who applied a couple of days ago.  She is a 50 or so years old who would afford a 100% or the rent , she has indicated in her application that her daughter (30ish) and granddaughter (11) will be living with her, they are under the occupant section of the application.

This lady has a clean record, good credit score and stable job with the county public school system.  My question is: should I be ok renting the unit with her being the only one responsible for the rent? or should I include her daughter as a co signer in stead of an occupant?

Background, credit and all other checks are being performed now for the daughter, will know the results soon.

Thank you