There are 3 foreshadows. Each one is progressively worse than the one before it.
- When the older brother actually does leave. That seems both harmless and natural enough. Older brothers leave all the time.
- When Aunt Nicey says read birds dying is bad luck. This is much more serious. Her pronouncement could be superstition (of course it is), but it is serious. Does a dead red bird foreshadow anything or not?
- The last one is the death of the Scarlet Ibis. Can we ignore that. Likely not. The Scarlet Ibis = Doodle