in thoughts of hanoi the speaker realizes that he and his brother might

be reconciled
live together once more
have to shoot one another
not actually be related

In thoughts of Hanoi, the speaker reflects upon the possibility of reconciling with his brother. This realization brings about various scenarios in the speaker's mind. Firstly, the thought arises that they could live together once more, perhaps putting aside any past conflicts or grievances. This idea holds the potential for a renewed bond and a chance to rebuild their relationship.

However, alongside this possibility, a darker thought emerges – the speaker contemplates the option of having to shoot one another. This suggests that their differences may be so irreconcilable that violence becomes the only course of action, a tragic and devastating outcome.

Furthermore, another uncertainty arises, questioning whether the speaker and his brother are actually related. This uncertainty adds a layer of complexity to their relationship, potentially challenging their shared history and bond.

In essence, these thoughts in Hanoi reflect the speaker's introspection on the potential outcomes of their reconciliation. It showcases a range of emotions, from hope and longing for familial unity to despair and doubts about their connection.