Englishman William Procter and Irishman James Gamble were destined to be at odds. From historically warring countries, they both settled in Cincinnatti, Procter as a candlemaker and Gamble as a soapmaker. They had to compete for the same materials, and the success of one would likely lead to the failure of the other. Love, however, has a way of working things out.
Both married into the Norris family, Procter to Olivia and Gamble to Elizabeth. The father of the Norris sisters, Alexander Norris, arranged a meeting between the two and convinced them to go into business together. Out of this union came Procter & Gamble, now one of the largest companies in the world – one that wouldn’t exist if not for the founders marrying sisters.
Source: Eden Barak