Fear Brewster Allerton died sometime before December 12, 1634. Disagreements with fellow Plymouth Colonists concerning his commingling his own merchant accounts with the colony's payments to the Merchant Adventurers for funding the Mayflower voyage increased after his second wife's death. Also, he had previously established a trading post in Maine, which interfered with the colony's monopoly on the fur trade and later with a British treaty. Thus, the elder Allerton moved south to the New Haven Colony. However, young Isaac did not initially join him. Instead he was raised by his maternal grandfather William Brewster, and eventually joined the family of his uncle Love Brewster. Meanwhile, by 1644, when elder Brewster died, the elder Isaac Allerton had again remarried, to his third wife, Joanna Swinnerton.
