Direct quote from a Yale admissions officer: “Being the child of a Yale alum helps – a little. And being the child of a Yale employee helps – a little.” If your mother works for Yale University, be sure to specify that in your application. If she is an employee of Yale-New Haven Hospital, doubt that will help, as it’s not part of the University. Can’t imagine that being a residential college fellow would matter, but I’m not an admissions officer.