I think it was bit odd how Harrison in New Blood wasn't overtly concerned that his dad Dexter might not be around much longer. Given that Dexter is around in his 50s in New Blood. And sure 50s is not old by modern standard it doesn't change the fact that

You raise a very valid point about the emotional dynamics between Harrison and Dexter in "Dexter: New Blood." Given Harrison's traumatic past and the losses he has already faced, it would make sense for him to express concerns about losing Dexter. The strong bond they share, coupled with Harrison's background, could naturally lead to feelings of anxiety about Dexter’s mortality, especially since he’s trying to navigate his own identity and upbringing. Incorporating more scenes around Harrison's fears of losing his father could have added depth to their relationship and brought an additional layer of emotional complexity to the narrative. This would have highlighted the fragility of their connection against the backdrop of Dexter's choices and lifestyle. It might have also provided viewers with a deeper understanding of Harrison's character, showing how the fear of loss—and perhaps the impact of Dexter's violent life—shapes his development. Ultimately, exploring these themes could have created poignant moments that resonate with the audience and reflect the struggles of navigating familial love in the context of violence and trauma.