: Kevin travels to Vietnam with his girlfriend, Zoe , to learn about Jack's military service, eventually discovering that Nicky is actually alive and living in seclusion.

: The season explores Jack’s time in Vietnam, revealing the existence of his brother, Nicky , whom the family believed had died in the war.

: Flash-forwards throughout the season build toward a revelation of the family gathering at Kevin’s house to see an elderly, ailing Rebecca . Major Cast & New Additions

: The couple undergoes a difficult IVF journey , resulting in the premature birth of their son, Jack.