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Robert "Robbie" Ferrier is the son of Ray and Mary Ann Ferrier, and the brother of Rachel Ferrier. He wanted to fight the aliens by joining the army. He runs to the army, and then an explosion occurs, and he isn’t there for the rest of the movie.

Robbie does however survives the battle on the hill and somehow makes his way to Boston where he is reunited with his sister Rachel and his father who is relieved that he is alive.