Kourtney Kardashian, 41, is the latest KarJenner sis to jump in Kylie Jenner‘s makeup chair — and the mother-of-three revealed her top parenting tips. The Keeping Up with the Kardashians star got very candid in Kylie’s new YouTube video which showed the 23-year-old cosmetics mogul doing her big sister’s makeup. “What is one piece of parenting advice that you would give me as a newer mom?” Kylie asked the Poosh founder, to which she replied, “Letting [Stormi] be seen and heard and understood.”