The old ones:
Pauline is two years, four months, and five days older than I am, so from the time I was old enough to play, I had a playmate. We got along as sisters usually do, with our share of fighting/arguing (Mother didn't allow physical violence). I remember at least once when I was six or seven that Mom made me stay home and let Pauline go off with the older girls. I wasn't happy of course, but Mother was right.
Renee is seven years, five months and about ten minutes younger than I am. That's enough age difference that we weren't playmates. She was just the cute little sister - the baby of the family.
We spent most of our adult lives widely separated geographically - Pauline in Florida, me in New Jersey and Renee in Kentucky. Often several years went by without our seeing each other. Now that I'm back in KY and Pauline spends summers in the state (although I'm still 250 miles from either of them and they are 90 miles apart), we like to get together at least once a year.
The young ones:
Sara said Rose ignores the baby much of the time, and Kyra tends to bother her too much. I imagine in a year or two they'll be saying, "Mommy/Sara keep her away from us; she's messing up our things." Such is life!