I a Daddy: 2-Year-Olds' Collaboration in Joint Pretend with Sibling and with Mother**Dale's study was conducted while the author was supported by a Medical Council Research Studentship and a grant from the Wellcome Foundation. The study by Dunn and Munn is supported by the Medical Research Council. We are very grateful for the help of the families in the sample.

Judy Dunn · Naomi Dale