Tonights episode, The Cabin, cements that theme with stories from different eras.
He doesnt want to make the wrong choice.
In the present, the adult Big Three are at the cabin for their Sad Three retreat.

THIS IS US — “The Cabin” Episode 412 — Pictured: (l-r) Justin Hartley as Kevin, Chrissy Metz as Kate — (Photo by: Ron Batzdorff/NBC).Ron Batzdorff/NBC
The final piece Jacks eye is missing.
Randall knows where it is.
Randall reveals his choice: the puzzle piece.
He says his anxiety never gets better.
He mentions Beths suggestion of seeing a therapist and Kevin agrees.
Then the siblings realize there are two more capsule items.
The first is Jacks dream house drawing.
The second is a tape recording by Jack.
Then he mentions the dream house.
He assumed that meant Rebecca had already retrieved it and put it in the capsule herself.Cue tears.
We see this in Rebecca through her Big Three college-era rescue of Kate fromher cabin trip with Marc.
He apologizes again for their fight and they exchange I love yous.
Cut to Rebecca and the boys driving to the cabin.
Randall, in turn, chastises Kevin for not being around enough.
At the cabin, Kate makes coffee.
After one brief sweet exchange, things again go awry.
In an ensuing verbal dispute, Kate insults Marc for being unemployed.
At this, Marcs face goes cold and he bitterly tells her to shut up.
She walks off to get firewood and as she does, he takes a jab at her weight.
His cruelty doesnt stop there.
While shes getting wood, he locks her out of the cabin.
In a winter snowstorm.
Kate doesnt say anything about their fighting, and even still talks Marc up.
But her brothers wonder why the cabin is so cold and soon Randall discovers a broken window.
Eventually, Marc admits he briefly locked Kate out and she cut her hand breaking back in.
Marc hesitates but doesnt resist.
Neither does Kate, letting herself break down in Rebeccas arms.
Kevin and Madison had agreed that morning not to tell Kate since their tryst was accidental.
But a guilt-ridden Madison left Kate multiple messages confessing.
Kate was nervous to leave Jack with Toby since they havent spent much time alone together.
But Toby insisted on being given a chance.
Then Tobys worst nightmare happens: Jack chokes on food.
Toby does the Heimlich and saves his son, but hes horrified it happened at all.
In a later scene though, a doctor assures him he did everything right and Jack will be fine.
It works, and father and son are both joyful.
When Kate shares her M-A-S-H time capsule entry, Randall says that Joey Lawrence has nothing on Toby.
Besides all the sibling drama unfolding at the cabin, theres also Rebeccas secret.
Kevins sobriety and Sophie heartache).
Kevin first goes into denial, insisting their mother was fine last time he saw her.
Distraught, and feeling betrayed, he storms off.
As Kevin processes, Kate and Randall do the puzzle.
Several scenes later, the adult siblings are leaving the cabin.
Kevin wistfully eyes the time capsule drawing of the house and the hilltop spot designated for it.
A time-lapse flashforward shows the house being built.
Then a grey-bearded Kevin arrives at the finished home.
Beth welcomes him, saying everyone is in with his mother.
This must be where we saw Rebecca sick in bed last season.
We see a framed picture of Jacks drawing in the entryway.
Jacks legacy looms large this episode but instead of overpowering, it amplifies Rebeccas place in it.
Its beautiful, and heartwarming, even as were barreling toward more painful journeys.
Bonus moments:
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