In interviews with a job candidate last year, Deborah D'Attilio, a recruiting manager in San Francisco for Enterprise Rent-A-Car, was surprised when the young woman brought a companion: her dad. Saying ''he was interested in learning about the work environment,'' the father sat in the lobby during the interview, D'Attilio says. She didn't hold it against the candidate and wound up hiring the young woman. Hovering parents are going to work. From Vanguard Group and St. Paul Travelers to General Electric and Boeing, managers are getting phone calls from parents asking them to hire their 20-something kids. Candidates are stalling...