Severide had a complicated relationship with his father, something made all

the more tense because of his relationships with different women outside

his original marriage. This includes a revelation in season 2 where the Lieutenant

learned he had a half-sister, Katie Nolan (Brittany Curran), who he later confronted his father about. Benny ended up dying in season 7 of a stroke, a loss he had to suffer with for quite some time. Now, it seems Chicago Fire season 13 will be opening these old wounds with Damon’s revelation.

In addition to Severide learning about his new half-brother, season 13 will also be focusing on the replacement for Wallace Boden (Eamonn Walker), Chief Dom Pascal (Dermot Mulroney), who will be introduced in the season premiere. This change in leadership, coupled with his family now expanding, means the Lieutenant will have a lot to deal with emotionally as the season begins. Despite this, though, it seems like he’ll be able to weather the storm, potentially with Damon as an ally, understanding the hardship the reveal may put him through.

While Severide and Damon could grow closer due to their shared father, the fact the newcomer kept the secret for so long means a wall of mistrust could come up between them. However, with the latter wanting to have a genuine friendship with his half-brother, that wall might not stay up for very long. Even though it will be difficult for the core character to reckon with this new element of his past, Chicago Fire season 13’s focus on it could help him better come to terms with his newfound family.