"Litter Mates" probably isn't the right word. "Kin?" "Siblings?" "Beloved Brothers & Sisters?" "Clan?"
Silly us. Look how we "lined up." We haven't been together since my mother's funeral in 2000, and this is only 6 of the 7 of us. Ronnie, our oldest brother, (our "captain"), couldnt' make it to this graduation party. So in our excitement, we didn't exactly compose ourselves into a nice group shot; we simply lined up in our well-understood youngest-to-oldest arrangement.
Incredibly, these same 6 people once piled into one wretched Chevy Impala, with our mother and father, and took The Vacation, the One Big Trip, from Chicago to a Wisconsin cabin, in the '60s. You haven't lived until you've sat for several hot, sticky, hours in the back seat of an Impala, in two layers, arguing over which child with diapers was most leak-proof and/or squirmy, and was going to be on YOUR lap for the duration.