Maybe they should've went with it.
It's the 60ies, the triplets have grown up and are no longer indistinguishable from one another.
One is married with children and works as a journalist on the hunt for new stories.
Second changes women more often than his underpants and a noir detective.
The third is a confirmed bachelor and a promising explorer.
Fate has it that their next jobs are intertwined with each other and the clues point at the direction of their Great Uncle.