Dear Prudence: The “Giving Tree” Edition

Prudie puts in a plug for queries about good fortune only. Then, she and writer Caille Millner tackle more serious problems: I’m convinced my husband had an affair with his boss, but he denies it. My mom is terrible with money. How can I get her to save for retirement so I don’t have to bail her out? My slacker brother-in-law has his parents duped into supporting him financially. I want to stage an intervention, but his mom won’t have it. Hear more Prudence by joining Slate Plus: Slate.com/Prudiepod. Learn more about your ad choices. Visit megaphone.fm/adchoices