Dear Dave, My husband and I have been following your plan, and we’re debt-free. Recently he invited his sister, her husband and their two kids to live with us. His brother-in-law recently lost his job, and he did this without talking to me first. I agreed after the fact, but do you think we need a roommate agreement or some kind of understanding while they stay with us? They have about $70,000 in debt, and they haven’t been very responsible with their money. Amanda Dear Amanda, I’ve got to tell you there’s zero chance that my wife or I would...