There's a Bit of An Age Gap
I have two older sisters and there's only two or three years between each of us, so we're spaced out pretty well. My little brother was born when I was in second grade. So there's a gap between us. This did not help in his being spoiled. Instead of having one mom and three sisters it was like he got four moms. Since all the girls were the same age, we learne stuff together, like cooking, dishes, and laundry. He had us to do it for him. There were actually times when I would start to explain how to do something and my mom would say, "Just do it for him, it's faster." It was extremely frustrating, but he and I are actually very close now.