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
You are Radha G member of NGO Awaaz write a letter to the editor of a national daily for a public movement to clean the Yamuna river you must introduce yourself describe how the people are to be blamed for polluting the river and suggest the need for installing water treatment plant to clean