Sibling issues are tricky, I have 2 that are both above 140, but one is significantly above and a "proud nerd" type. The other thinks she is not the smart one. I have spent the last year homeschooling her proving to her otherwise and she is finally getting it that she is not just the "athletic" one in the family. I also have 2 that are adopted,average intelligence, and come with all the outside issues that come with that. Walking circumspectly is daily parenting gymnastics.