Forget "growing out of it." We think it might take a lifetime for kids to adjust to the fundamental unfairness of having a sibling. Mentioned: This article on little kids and jealousy [http://globalnews.ca/news/3681102/is-your-child-jealous-of-their-sibling-heres-what-parents-can-do/] and this image of inclusion [https://www.thinkinclusive.us/cool-graphic-education-boxes/].