Juan Bucio, father of Joshua and Jacob Bucio, died while searching for a person in the Chicago River on May 28.
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Schwarber met the boys, ages 7 and 9, at a firehouse on Thursday and presented them with jerseys and signed baseballs.
The boys then got to watch the Cubs take batting practice and watched Thursday night's game.
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Juan Bucio was a 15-year veteran of the department, who spent the last 11 years of his career in the Marine and Dive Operations Unit. Prior to CFD, Bucio was a Chicago police officer from 2000-2003.
He was one of ten children, two of whom currently serve the city. His brother is a Chicago firefighter and his sister is a Chicago police officer.
Bucio was 46.