Addendum to lease - tenant's two adult kids moving in temporarily

[Julianne Croegaert]

I need to add an addendum to my tenant's lease agreement stating she has permission to move her two adult children in.  This is a temporary situation since they are between rentals themselves.  (I am fine with it and have screened them.)  But she doesn't want them officially added to her lease (i use ezLanlordForms.com).  What sort of document do i use or create stating they are temporary guests and that all responsibility remains with my tenant for payment and any damages?  Thanks in advance.