149. fictive grandparenting: style that allows adults to fill in for missing or deceased grandparents, functionally creating the role of surrogate grandparent.
150. filial obligation: sense of responsibility to care for a parent if necessary.
151. fine motor skills: motor skills associated with grasping, holding, and manipulating objects.
152. fluid intelligence: abilities such as thinking in a flexible, adaptive manner, drawing inferences, and understanding relations between concepts.