Clearly, from what you and others have said, I was hasty in defining this as an older sibling thing - though I do think that's likely to be the most common way that it manifests, especially when you take into account not only the age difference (some people do - erroneously - see giving up a rich imaginative life as part of "growing up"), but also the greater responsibility typically put on older siblings' shoulders (it's made clear in Susan's case that she sees herself as shouldering a quasi-maternal role). But differences in personality and friendship groups are also important, as your own example and that of Holly Black's characters make clear. I suspect that the Lewis boys and the Bronte siblings were in situations of relative isolation, which must have made them even more mutually dependent, especially since both groups were growing up with out a mother.
I'd not heard of Ginger Snaps! Though reading about it briefly, it sounds as if I used a similar plot in my story for Twisted Winter. I will seek it out.
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Clearly, from what you and others have said, I was hasty in defining this as an older sibling thing - though I do think that's likely to be the most common way that it manifests, especially when you take into account not only the age difference (some people do - erroneously - see giving up a rich imaginative life as part of "growing up"), but also the greater responsibility typically put on older siblings' shoulders (it's made clear in Susan's case that she sees herself as shouldering a quasi-maternal role). But differences in personality and friendship groups are also important, as your own example and that of Holly Black's characters make clear. I suspect that the Lewis boys and the Bronte siblings were in situations of relative isolation, which must have made them even more mutually dependent, especially since both groups were growing up with out a mother.
I'd not heard of Ginger Snaps! Though reading about it briefly, it sounds as if I used a similar plot in my story for Twisted Winter. I will seek it out.