This study investigates generativity, or a concern for future generations, in the relationships between uncles and nephews. Using in-depth interviews, 21 uncles and 31 nephews were interviewed in Wellington, New Zealand and Bangor, Maine. Uncles describe themselves as supplements to parents, as friends, or as surrogate parents. Uncles act as mentors by providing nephews with advice and sometimes criticism. They act as intergenerational buffers and family historians by engaging in family work with nephews, providing insights into the behavior of parents or siblings. In turn, nephews provide uncles with insights into the behavior of family members. This study contributes to the literatures on generativity, men and caregiving, and more broadly third-party influences in family relationships.