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[Spoiler alert: Spoilers ahead for You Season 3.]

During the Season 3 finale of You, viewers found out that Joe Goldberg had a half-brother his mom opted to raise while he lived in a group home. Although he seemingly never meets his sibling, many fans believe he has and doesn’t know it yet.

'You' star Penn Badgley as Joe Goldberg
Penn Badgley as Joe Goldberg during ‘You’ Season 3 Episode 1 | John P. Fleenor/Netflix

Viewers find out about Joe’s possible half-brother during ‘You’ Season 3 finale

After Joe Goldberg (Penn Badgley) killed his wife and mother of his child, Love Quinn Goldberg (Victoria Pedretti), he gave the viewers insight into his past as he staged a murder-suicide scene.

When Joe shot and killed a man who abused his mother, she sent him away to a group home. As she promised they would be together, Joe thought his mom would come back for him, a belief that got him relentlessly bullied.

At one point, he found his mother exiting an apartment with a child, seemingly her son, who she called Jakey. When he approached her and wondered if they would reunite, his mother told him she needed a new start.

Wishing the same for his child Henry but not wanting him to end up in the foster care system, he gave his son to a kind librarian coworker, Dante Ferguson (Ben Mehl), and his husband. 

Some believe Theo Engler is Joe’s half-brother; others disagree

Many fans took to social media to share their theories and predictions for the confirmed upcoming fourth season following the finale.

One fan pointed out they believe Joe’s half-brother is Theo Engler (Dylan Arnold), the stepson of the next-door neighbor’s wife, who Love killed. They noted he’d been introduced explicitly as the stepchild, which they think the writers have purposefully done.

The viewer also noted they believe Theo is intentionally kept alive and think he discovers the connection next season when they think he and his father continue attempting to solve Natalie Engler’s (Michaela McManus) murder. Additionally, another user claims they see a close resemblance between a young Joe and Theo.

However, other fans do not believe Theo and Joe are related as his mom referred to the boy as “Jakey” in the flashback. Some also pointed out the improbability of the two, both relocating from New York to the same Los Angeles suburb. Finally, during the conversation with his mother, she never claimed Jakey as her own, leading some viewers to believe the boy isn’t actually Joe’s half-brother. 

Love Quinn Goldberg and Theo had an affair

Viewers were first introduced to Theo when he flirted with Love in the parking lot of a grocery store. The college student had a strained relationship with his stepfather and ended up moving back home when he didn’t like things at home with his mother.

Even though he knew Love was married with a child, he made several advances toward her, and the two eventually kissed before hooking up. Theo ended up taking a break from school because he claimed he couldn’t stop thinking about Love and attempted to get her away from Joe after identifying him as the last person to see Natalie alive.

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After finding the Goldberg’s cage, with Sherry (Shalita Grant) and Cary Conrad (Travis Van Winkle) locked inside, Love hit him in the back of the head, believing she killed him. When getting ready to take care of his body, Joe discovers Theo is still alive and has had an affair with his wife but lets the college student go.

During the finale, his stepfather wheeled him out of the hospital following his release while Joe seemingly began a new life in Paris, searching for Marienne Bellamy (Tati Gabrielle). You is streaming on Netflix.