I was friendly with a family who moved away last summer. The kids are now 10, 8, and 6. I would like to keep in touch with one of the three kids -- she's the middle child, with all that entails, and I've always been especially fond of her.
I recently found a (used) book about horses I think she'd like. Would it be acceptable to send a little gift for her without including something for her siblings? For what it's worth, I don't especially like her siblings, so keeping them happy isn't much of a priority for me. On the other hand, I suspect they will pitch unholy fits if they find out, and I don't want to cause any more problems in an already...less than serene family.