research into role of the father
Grossman: longitudinal study looking at both parents behaviour, the quality of attachment in adolescence came from mothers, suggesting fathers less important and quality of play came from fathers suggesting fathers role is around play not comfort.
Field: observed primary caregiver mothers, fathers and secondary fathers interacting with 4 month olds, fathers in general focused on game playing but primary fathers were more sensitively responsible like mothers and took on the role of a mother