‘This Is Us’: The Mother of Kevin’s Son Could Be This Forgotten Character

One of the latest This Is Us mysteries came about in the season 3 finale. The ending scenes revealed Kevin (Justin Hartley) has a son in the future. The question is, who’s the boy’s mother? Fan theories have suggested it could be season 4 newcomer, Cassidy (Jennifer Morrison). But, maybe it’s someone viewers forgot about.

Why the theories of Cassidy may be off

Justin Hartley
Justin Hartley from ‘This Is Us’ | Rachel Luna/Getty Images

From the moment Morrison’s character was introduced as part of the season 4 lineup, fans theorized her to be the mother of Kevin’s son in the flash-forward.

The military officer has Post Traumatic Stress Disorder from serving in Afghanistan and is trying to stay sober. She and Kevin met after Uncle Nicky (Griffin Dunne) threw a chair through the window of her veteran’s support group. Kevin came to Nicky’s rescue and the two met.

While some think Kevin and Cassidy end up together, the son in the flash-forward may not even be Kevin’s biological child ut one he adopts with Cassidy.

To go even further down the rabbit hole, some fans think Cassidy could be an estranged daughter of Nicky’s.

View this post on Instagram

Meet Cassidy. #ThisIsUs | : @jennifermorrison

A post shared by This Is Us (@nbcthisisus) on

Series creator, Dan Fogelman said Cassidy and Kevin’s relationship “is complicated.”

He continued: “It’s formative, and it’s a very deep, interesting, bizarre relationship. And whether or not it’s ever romantic is for the series to delve into a little bit later on.”

Though Morrison fought to play the role of Cassidy, there’s one reason she may not be who ends up with Kevin in the end: it’s too predictable. One thing This Is Us writers are known for is tossing in a red herring here and there to keep viewers engaged and surprised with big reveals.

If Cassidy is the mother of Kevin’s son, you wouldn’t watch Kevin and Cassidy’s interactions in season 4 and see it coming.

Fans really want to see Kevin and Sophie end up together

This Is Us fans want Kevin and Sophie together. Period. Sure, the two got married young and it ended in heartache. And yes, they tried again as adults and Kevin messed it up again. But they may find their way back (again) right?

Last Kevin tracked Sophie down, she was happily engaged. If their biggest issues were Kevin’s infidelity and his ability to run to Sophie whenever life challenged him, things could work out for them in the future.

Kevin isn’t the man he was at the beginning of season 1 and Sophie may see the positive changes and decide it’s worth a shot. That said, we can’t rule out the fact that the child in the flash-forward might be Sophie’s.

Who could be the mother of Kevin’s son?

Remember Kate’s (Chrissy Metz) frenemy-turned-friend, Madison (Caitlin Thompson)? Madison and Kate’s relationship weaved throughout the seasons. But, she’s remained a side character not always directly involved with the Pearsons (outside of Kate).

If you’ll remember the wedding reception in season 3, fans had reason to speculate a possible romance between Kevin and Madison. But then, the big reveal came as Kevin and Zoe (Melanie Liburd) on a plane to Vietnam — not Madison.

Fogelman — who happens to be married to Thompson in real life — weighed in after the episode.

This could be another red herring in hopes that fans will latch onto another theory. And because Kevin and Zoe went strong for a while, Madison as a possibility fell to the background.

Maybe Fogelman changed his mind or maybe Madison was the plan all along. Kevin dated a lot of women so who knows. Either way, the mystery of who mothers Kevin’s son will be solved eventually (we hope).