"This Is Us" dropped another final moment bombshell on viewers.
At the end of the Season 2 episode appropriately titled "Brothers," it was revealed that Jack Pearson had a younger brother named Nicky. When both Pearson boys were waiting for their drunk dad to get out of a bar and take them camping, Jack told Nicky he'd never leave him. We also saw older Jack looking through Vietnam photos, and we saw Nicky again.
It looks like Nicky probably died in Vietnam. This is the first fans have heard about Nicky, and Jack never told his own wife Rebecca or their kids.