How does a business relationship last 3 generations?

Tomasz & son, Piotr Witomski are Dilmah Tea in Poland. The friendship that began amongst Janusz and Zofia Witomski and Merrill J. Fernando evolved into a family business that now spans 3 generations – Merrill, followed by Dilhan & Malik, now Amrit and the rest of the 3rd Generation of the Dilmah Family.