On this episode: Zak Rosen, Elizabeth Newcamp, and Lucy Lopez dive into a letter from a parent with three kids spanning college to preschool — and two of them are acting like they run the nursery. What do you do when your teens become self-appointed disciplinarians for your four-year-old? And how do you re-establish the line between “big sibling” and “co-parent” without sparking a family feud? After that, of course, we’ll circle up for a round of triumphs and fails. Join us on Facebook and email us at [email protected] to ask us new questions, tell us what you thought of today’s show, and give us ideas about what we should talk about in future episodes. You can also call our phone line: (646) 357-9318. If you enjoy this show, please consider signing up for Slate Plus. Slate Plus members get to hang out with us on the Plus Playground every week for a whole additional grab-bag of content — and you’ll get an ad-free experience across the network. And you’ll also be supporting the work we do here on Care and Feeding. Sign up now at slate.com/careplus – or try it out on Apple Podcasts. Podcast produced by Palace Shaw. Learn more about your ad choices. Visit megaphone.fm/adchoices