Hal and Harper's childhood house is on the market, and Dad's got even bigger news that's about to send all three on a journey through time.

When Dad and Kate receive concerning news about their baby, Hal and Harper head to San Francisco to check on them.

Hal and Harper navigate social life in elementary school while Dad reckons with emotional wounds of the past and present.

Hal and Harper struggle to connect with their classmates. Dad takes them to an arcade.

Halloween causes Harper and Jesse to reflect on the past and present state of their relationship.

In the past, Dad finds solace in his children, while in the present he has to decide what he wants and needs.

Harper spends time with Audrey while Hal takes Kalen to Vegas for his grandmother's funeral.

The past and present collide as Hal and Harper and Dad face the emotional toll of the past two decades together.